### CBSE IX Physics Motion

## 1. A car is travelling along the road at 8 m/s .It accelerates at 1m/s2 for a distance of 18m. How fast is it travelling?

2.The distance between mumbai to delhi is 1384. A train starts from Mumbai at 4pm and reaches delhi at 10 am the next day.What is its average speed?

3.State the 3 equations of motion. Which equation describes velocity-time relation and position -time relation?

4. A cheetah starts from rest and accelerates at 2 m/s2 for 10 seconds. Calculate the final velocity and the distance travelled?

**Vaibhav BR**16th May 2014 11:55 AM

### CBSE X Physics Sources of Energy

## AN OBJECT MOVES WITH ACCELERATION "ALPHA" FOR SOME TIME AND "BETA"FOR ANOTHER TIME.THE OBJECT STARTS FROM REST AND IN ANOTHER HALF FINALLY COMES TO REST .THE EVENT TAKES PLACE IN TIME "t".FIND THE MAXIMUM VELOCITH ATTAIED AND TOTAL DISTANCE TRAVELLED BY THE OBJECT?

**ENGLISH DSOUZA**4th June 2014 6:12 AM

### CBSE XI Science Physics Motion in a Straight Line

##
###

the position of the particle along x-axis varies with time as

x = 4t^{2} - 6t + 1, then:

(a) What is the velocity at t = 0?

(b) When does velocity become zero?

the position of the particle along x-axis varies with time as

x = 4t^{2} - 6t + 1, then:

(a) What is the velocity at t = 0?

(b) When does velocity become zero?

**Masood khan**15th June 2015 1:07 PM

### CBSE XI Science Physics Motion in a Straight Line

## A student goes from his house to his friend's house with speed v1. Finding the door of his friend's closed,return back to his own house with the speed v2. Then the average speed of the student is

**Anil**28th May 2017 6:28 PM

### CBSE XI Science Physics

## The velocity of a particle moving on the x-axis is given by v=x^2+x, where x is in m and v is in m/s. What is its position when its acceleration is 30 m/s^2

**Anil**18th June 2017 7:59 PM

### CBSE XI Science Physics Motion in a Straight Line

## q

**gpnkumar0**2nd October 2017 11:23 AM

### CBSE XI Science Physics Motion in a Straight Line

## q

**gpnkumar0**2nd October 2017 11:27 AM

### CBSE IX Physics

## A hot air balloon starts rising from ground with an acceleration 1.25m/second square. After 8 sec, a stone is dropped from the balloon. The balloon will-
A)cover a distance of 40m before hitting the ground
B) have a displacement pf 50m on hitting the ground
C)reach the ground in 4 seconds

**adityaahuja099**11th October 2017 6:08 PM

### JEE JEE (Main) Physics Centre of Mass and the Law of Conservation of Momentum

## a small ball is dropped from a height h onto a rigid frictionless plate at b and rebounds find the maximum height reached after rebound if the coffecient of restitution between the ball and the plate is e=0.75

**harinderk13**30th October 2017 10:44 AM

### NEET1 ALL Class Kinematics

## A car starts from rest with an acceleration of 6 m/s2 which decreases to zero linearly with time, in 10 seconds, after which the car continues at a constant speed. Find the time required for the car to travel 400 m from the start.

**Arushi Juyal**12th November 2017 3:07 PM

### NEET1 NEET1 Kinematics

## A particle starts from rest and traverses a distance l with uniform acceleration, then moves uniformly over a further distance 2l and finally comes to rest after moving a further distance 3l under uniform retardation. Assuming entire motion to be rectilinear motion, the ration of average speed over the journey to the maximum speed on its way is:

**Arushi Juyal**12th November 2017 3:22 PM

### ICSE IX Science Laws of Motion

## Solve this problem: A body moving with uniform acceleration Travels 84 metre in the first 6 second and 180 m in the next 5 seconds. find: (a) the initial velocity ,and (b) the acceleration of the body.

**Karuna**19th November 2017 11:35 AM

### JEE ALL Class Physics Motion in a Plane

## please solve the question

**jaychandran1967**1st December 2017 10:39 PM

### NEET1 ALL Class Kinematics

## please explain

**Arushi Juyal**16th December 2017 6:39 AM

### ICSE VIII Physics Force and Pressure

## A car of mass 1000kg is moving with a certain speed when a constant breaking force of 1000 N acts on it for 5 seconds and the speed of car reduces to half its original speed. Find the further time required to stop the car if the same constant force acts.

**mkp400**17th December 2017 12:26 PM

### JEE ALL Class Physics Motion in a Straight Line

## please solve the question

**jaychandran1967**19th December 2017 8:13 PM

### JEE ALL Class Physics Motion in a Straight Line

## a 2m wide truck is moving with a uniform speed of 8m/s along a straight horizontal road. a pedestrian starts crossing the road at an instant when the truck is 4m away from him. the minimum constant velocity with which he should run so as to avoid the accident

**jaychandran1967**20th December 2017 11:46 AM

### CBSE IX Physics Force and Laws of Motion

## A boy on a cliff 19.6m high drops a stone. 1 second later he throws a second stone after the first. They both hit the ground at the same time. With what speed did he throw the second stone?

**aahnik.mohanty**24th December 2017 8:29 PM

### JEE ALL Class Physics Motion in a Straight Line

## Solve this

**venkat**25th December 2017 8:56 PM

### JEE ALL Class Physics Motion in a Straight Line

## Solve this

**venkat**25th December 2017 9:03 PM

### JEE ALL Class Physics Motion in a Straight Line

## Solve this

**venkat**25th December 2017 9:06 PM

### CBSE IX Physics Force and Laws of Motion

## 2 identical bodies are allowed to fall from different heights h1 and h2. The ratio of their momentum when they reach the ground will be?

**adityaahuja099**29th December 2017 3:43 PM

### ICSE IX Physics

## Selina Publishers : Concise Physics : Class IX : Chapter 2 : Exercise 2(B) : Question number 3 : part 1 :----- Why is 6m being subtracted from 18m ?

**Lynet_Melinda**13th January 2018 12:40 PM

### CBSE XII Science Physics

## A stone falls freely under gravity .it covers distance h1,h2,h3 in the first 5s ,the next 5s and the next 5s respectivpy . The relatn between h1,h2,h3 is

**srivastavsanjana6**31st January 2018 12:18 AM

### NEET1 NEET1 Physics

## Explain min distance and time approach in crossing a river with diagram

**ashutosh25807**1st February 2018 11:59 AM

### ICSE IX Physics

## how much distance will a body of 500g move in 10 seconds when a force of 0.1 N is applied

**Shamz**15th February 2018 11:33 PM

### ICSE XI Science

## Question - 2 : A ball falls freely on a perfectly elastic plate from a height of 3.0 m. At the instant t = 0 , the velocity of the ball is zero. Draw time - velocity graph for the motion of the ball. Label the axes and show the mathematical calculations required. ( g = 9.8 m/s^2 ).

**sudhanshubhushanroy**25th February 2018 4:17 PM

### ICSE X Physics

## 1)A body starts from rest.what is the ratio of the distance traveled by the body during the 4th and 3rd second. 2)A person is standing in an elevator.In which case he finds his weight less than actual a)the lift moves up with constant acceleration b)the lift moves down with constant acceleration c)the lift moves up with uniform velocity d)the lift moves down with constant velocity Plz urgent

**Sunita**27th February 2018 10:11 PM

### CBSE IX Physics

## Answer 19 with explanation

**md775016**2nd March 2018 10:02 PM

### JEE JEE (Main) Physics

## two cars, P and Q start side by side from rest at the same instant and in the same direction. P accelerates uniformly at 4 metre per sec square for 10 sec and then moves with uniform velocity. Q moves with uniform acceleration of 3 metre per sec square. find the distance between them 30 seconds after start. which one is ahead and why?

**shreeyarokade**1st April 2018 11:05 AM

### JEE JEE (Main) Physics

## a car A travelling along a straight level road with a uniform speed of 60 km/hr. it is followed by another car B which is travelling uniformly at 70 km/hr. when the distance between them is 2.5km, the car b decelerates at 20 km/hr sq. where will B catch up with A?

**shreeyarokade**1st April 2018 12:40 PM

### ICSE IX Physics

## A body thrown vertically upward with velocity u .what will be the greatest height H to which it will rise

**Kanwaranita10**7th April 2018 12:01 PM

### ICSE IX Physics

## For A body moving from rest and moving with uniform acceleration the ratio of distance covered for 1 second ,2 second, 3 second is ?

**Kanwaranita10**7th April 2018 12:02 PM

### ICSE IX Physics

## A ball is gently dropped from a height of 15 m. If its velocity increases uniformly at the rate of 10 M per second square velocity with which it will strike the ground is.

**Kanwaranita10**7th April 2018 12:03 PM

### ICSE IX Physics

## A body moving from rest with uniform acceleration Travels a distance x in first t seconds and travels a distance Y with same acceleration in next 2 seconds find the value of Y

**Kanwaranita10**7th April 2018 12:07 PM

### CBSE IX Physics

## Please reply with solution

**meghnananavati**16th April 2018 6:05 PM

### CBSE X Physics

## If a freely falling body travels in the last second a distance equal to the distance travelled by it in first 3 seconds, then find the time of its travel.( in seconds)

**acv27joy**21st April 2018 7:15 PM

### JEE JEE (Main) Physics

## Solve the following

**venkat**21st April 2018 11:44 PM

### JEE JEE (Main) Physics

## Which option is correct? Sir I want detailed explanation

**venkat**23rd April 2018 4:51 PM

### JEE JEE (Main) Physics

## Question is in picture kindly solve it

**sakshisingh3124**1st May 2018 11:27 AM

### CBSE XI Science Physics

## two balls a and b are released from rest from the roof of a building at t=0 and t=2s respectively.the ball a strikes the ground and rebounds back with the same speed.after some time both balls a and meet each other at a height of 55m from the ground.the height of the building is

**Prasanna**7th May 2018 9:17 AM

### NEET1 NEET1 Physics

## A partial start from rest and has an acceleration of 2m/s^2 for 10s. After that ,it travels for 30s with constant speed and then undergoes a retardation of 4 km/s^2 and comes back to rest. The total distance covered by the particle is 1)650m 2)750m 3)700m. 4) 800m

**Kajalmandal64**11th May 2018 2:47 PM

### NEET1 NEET1 Physics

## A ball is droped from a high rise platform t=0 starting from rest. After 6s another ball is thrown downwards from the same platform with a speed v . The two ball meet at t=18s . What is the value of v ? 1)74m/s 2)64m/s . 3)84m/s. 4)94m/s

**Kajalmandal64**11th May 2018 2:53 PM

### CBSE X Physics

## A stone is dropped into a well and the sound of the splash is heard after 25/8 seconds later. If the velocity of sound in the air is 352.8 m/s,find the depth of the well.(g = 9.8 m/s^2)

**acv27joy**12th May 2018 7:35 PM

### CBSE X Physics

## A,B,C and D are points in a vertical line such that AB =BC=CD. If a body falls freely through A, prove that the time of descent through AB,BC and CD are in ratio 1:root2-1:root3 - root2. Give ans quickly in proper steps

**acv27joy**12th May 2018 7:39 PM

### CBSE X Physics

## A body is dropped from a certain heigh H. If the ratio of distance travelled by it in (n-3)seconds to (n-3)nd secondsecond is 4:3, find H.(g = 10 m/s^2)

**acv27joy**12th May 2018 8:18 PM

### CBSE X Physics

## A car is moving at a certain speed stops on applying within 16 m. If the speed of car is doubled, maintaining the same retardation, then at what distance does it stops? Also calculate the percentage change in distance.

**acv27joy**12th May 2018 8:26 PM

### JEE JEE (Main) Physics

## how can i solve this numerical?

**pukai7229**16th May 2018 9:28 AM

### JEE JEE (Main) Physics

## can someone please help me with?

**pukai7229**16th May 2018 9:30 AM

### JEE JEE (Main) Physics

## please do this sum for me!!

**pukai7229**16th May 2018 9:33 AM

### JEE JEE (Main) Physics

## how do I do this numerical?

**pukai7229**18th May 2018 1:24 PM

### CBSE X Physics

## A all thrown upwards returns to the ground with the initial speed of u. The ball is at the height of 80 m at two times the time interval being 6 seconds. Find u, by assuming g=10m/s^2. (Please explain with diagram)

**acv27joy**19th May 2018 7:03 PM

### ICSE IX Physics

## A train starts from rest and accelerates uniformly at a rate of 2 m/s2 for 10 seconds.It then maintains a constant velocity for 40s.On applying brakes, a train is uniformly retarded and stops in 20s.Calculate : (1) maximum velocity reached (2) retardation in last 20 secs (3) total distance travelled (4) average velocity of the train?

**nishola82**22nd May 2018 11:39 PM

### ICSE IX Physics

## A truck running at 72 km/h is brought to rest over a distance of 25 m.Calculate the retardation and time for which brakes are applied ?

**nishola82**22nd May 2018 11:44 PM

### CBSE IX Physics

## A motorbikie running at 90 km/h is slowed down to 50 km/h by application of brakes over a distance of 40m.If the brakes are applied with the same force.Calculate : (1) total time in which bike comes to rest ? (2) total distance covered by the bike ?

**nishasaumitya**22nd May 2018 11:56 PM

### CBSE IX Physics

## A space ship travelling in space at 200 km/s, fires its engine for 10 s, such that its final velocity is 600 km/s.Calculate the total distance travelled by the spaceship in 30s starting from the time of firing ?

**nishasaumitya**23rd May 2018 12:02 AM

### CBSE IX Physics

## A body moving with uniform acceleration travels 24m in 6th second and 44 m in 11th second.Find the :(1) acceleration (2) initial velocity of the body ?

**nishasaumitya**23rd May 2018 12:06 AM

### ICSE IX Physics

## A cyclist driving at 36 km/h stops in 2s by the application of brakes.Calculate : (1) retardation (2) distance covered during application of brakes ?

**Vikas**23rd May 2018 12:20 AM

### ICSE IX Physics

## A train is moving with a velocity of 90 km/h when the brakes are applied.The retardation produced is 0.5 m/s2.Find: (1) velocity after 10 s ? (2) time taken by train to come to rest ?

**Vikas**23rd May 2018 12:24 AM

### CBSE X Physics

## A car moving on a road with uniform accleration covers 20m in the first second and 30m in the next second. What is accleration?

**acv27joy**26th May 2018 9:46 PM

### CBSE IX Physics

## An object starts from rest and is uniformly accelerated so that its speed is 60 m/s after 20s. If it travels with this speed for 40 s and is then brought to rest by a uniform retardation in 30 s. Sketch the velocity-time graph and calculate the acceleration, the retardation and the total distance travelled.

**sbajaj544**5th June 2018 11:34 AM

### NEET1 NEET1 Physics

## A bike and a car start from rest at the same place at the same time in the same direction. The bike accelerates uniformly at 1m/s^2 upto a speed 10m/s and the car at 0.5 m/s^2 upto speed of 15m/s. At what time the car overtakes the bike?

**Heraumna176**5th June 2018 8:07 PM

### CBSE IX Physics

## Draw the velocity time graph to show the train started from rest velocity, then move with uniform velocity for same time and then retard .

**Chaudharydheeraj130**8th June 2018 11:01 AM

### CBSE IX Physics

## A child drop a ball from a window, the ball strike the ground in 3 s. what is the velocity of the ball before it hit the ground

**Nimmi**9th June 2018 3:14 PM

### CBSE XI Science Physics

## If 't' is the time of ascent , find the depth of shaft in question 37:-

**arunavamitra50**16th June 2018 5:27 PM

### CBSE XI Science Physics

## An object is dropped from rest . It's velocity versus time graph will be ? ( Assume downward to be positive)

**arunavamitra50**16th June 2018 5:30 PM

### CBSE XI Science Physics

## What will be the answer of question 27 ?

**arunavamitra50**16th June 2018 6:08 PM

### CBSE XI Science Physics

## What would be the answer of question 18 ?

**arunavamitra50**16th June 2018 6:09 PM

### CBSE IX Physics

## A motorcycle starts from rest and uniformly accelerates at 1m/s.Find the distance travelled in the 3rd second.

**poojaramesh742**17th June 2018 1:15 PM

### CBSE XI Science Physics

## Please answer question number 27 .

**arunavamitra50**19th June 2018 1:31 PM

### CBSE XI Science Physics

## The particle is moving on a straight line path with initial velocity 45m/s and along +ve x-axis and acceleration of 10. along -ve x-axis. The distance travelled by the particle in 5th second of its motion is ?

**arunavamitra50**21st June 2018 7:05 AM

### CBSE IX Physics

## A ball is dropped from a height of 49m. Find the time interval in which the ball hits the ground (g=9.8/s square)

**adItTYAGuPtaiLt**21st June 2018 7:21 PM

### CBSE XI Science Physics

## A ball is thrown vertically upwards with speed of 10m/s from the top of the tower 200m high and another is thrown vertically downwards with the same speed simultaneously.the time difference between them in reaching the ground in seconds(g=10m/s²)

**Sachinkumarrayray7755**22nd June 2018 2:58 PM

### JEE JEE (Main) Physics

## how to do this numerical??

**pukai7229**23rd June 2018 10:09 AM

### CBSE XI Science Physics

## A body is thrown vertically upward with a definite velocity from different places on the earth. Prove that the time of return of the body at a place will be inversely proportional to the acceleration of gravity at that place.

**bdroy_2014**27th June 2018 10:00 PM

### ICSE X Physics

## A car of mass 1000 kg accelerates from rest to 100 km per hour in 8 seconds what is the acceleration and the accelerating force developed by car engine

**Samrat**29th June 2018 9:53 PM

### CBSE XI Science Physics

## A body starts from rest and moves with constant acceleration for t seconds.It travels a distance X1 in first half of time and X2 in second half of time.Then which one is correct? 1) X2=X1 2)X2=2X1 3)X2=3X1 4)X2=4X1

**tps.mjmdr**1st July 2018 11:06 PM

### CBSE XI Science Physics

## A body moving with uniform acceleration travels a distance of 24m and 64m rurind the first two equal consecutive intervals of time each of duration 4 second. Determine the initial velocity and acceleration of moving body.

**tps.mjmdr**6th July 2018 9:09 PM

### CBSE XI Science Physics

## A stone A is dropped from the top of a tower 20 m high. simultaneously another stone B is thrown up from the bottom of this tower so that it can can reach just the top of the tower what is the distances of the stone from ground while they pass each other.

**tps.mjmdr**9th July 2018 5:28 PM

### CBSE XI Science Physics

## A bus starts moving with an acceleration of 2m/s^2 a cyclist 96 M behind the bus starts moving simultaneously towards the bus at 20 m/s.After what time will he be able to overtake the bus.

**tps.mjmdr**9th July 2018 5:30 PM

### CBSE XI Science Physics

## A body covers 12 metre in 2nd and 4th second.Find what distance the body will cover in 4 seconds after 5th second.

**tps.mjmdr**9th July 2018 5:34 PM

### CBSE XI Science Physics

## Two motor cars start off with a gap of 2 min with the same acceleration how long after the departute of the second car does travel a distance equal to 1/9th of the distance covered by the first car.

**contactpasala**9th July 2018 8:23 PM

### JEE JEE (Main) Physics

## A police chase a thief with a velocity uniform velocity 'v'. When the jeep was at a distance 'd' from a thief then the thief fled from the rest with an acceleration 'a'. so prove that the police caught the thief if v>=root over 2ad.

**mugembosapta**12th July 2018 11:43 PM

### CBSE XI Science Physics

## Car starting from rest accelerates at the rate f through a distance of s and continues at a constant speed for time t and decelerates @ f/2 to come to rest. If the total distance travelled is 5s then prove that s=0.5 ft square.

**tps.mjmdr**13th July 2018 7:37 AM

### JEE JEE (Main) Physics

## a body covers a distance of 4m in 3rd and 12m in 5th sec if the motion is uniformely accelerated how far will it travels in the next 3sec

**gargpuneet989**17th July 2018 5:12 PM

### JEE JEE (Main) Physics

## A ball is dropped from a balloon going up at a speed of 7 m/s. If the balloon was at a height 60 m at the time of dropping the ball, how long will the ball take in reaching the ground

**gargpuneet989**19th July 2018 2:50 PM

### JEE JEE (Main) Physics Motion in a Straight Line

## A ball is dropped from a balloon going up at a speed of 7m/s. If the balloon was at a height 60 m at the time of dropping the ball, how long will the ball take in reaching the ground ?

**Yash**20th July 2018 12:46 AM

### CBSE XII Science Physics

## a solid ball of density half of that of water falls freely under the action of gravity from a height of 19.6 and then water enters into tje water upto depth of？

**sbtech357**22nd July 2018 9:32 AM

### CBSE XII Science Physics

## when the ball is released from height 5m it rebounds to the height of 3m. with whate velocity it should be dropped so that it rebounds its height

**sbtech357**23rd July 2018 10:28 AM

### CBSE XI Science Physics

## A stone is dropped from a certain height which can reach the ground in 5s. It is stopped momentarily after 3s of its fall and then it is again released. The total time taken by the stone to reach the ground will be A. 6s B. 6.5s C. 7s D. 7.5s

**shyamalimaborthakur89498**4th August 2018 8:50 PM

### CBSE XI Science Physics

## A ball is dropped from a height of 20m and rebounds with a velocity which is 3/4 of the velocity with which it hits the ground. What is the time interval the first and second bounces ( g = 10m/s^2)

**shyamalimaborthakur89498**5th August 2018 12:34 PM

### Maharashtra X Physics

## A stone thrown vertically upwards with initial velocity u reaches a height 'h' before coming down. Show that the time taken to go up is same as the time taken to come down.

**akshaywbr**17th August 2018 4:15 PM

### NEET1 NEET1 Physics

## a particle starts from rest and travels a distance s with uniform acceleration,then it travels a distance 2s with uniform speed,finally it travels a distance 3s with uniform retardation and comes to rest.if the complete motion of the particle is a straight line then the ratio of its average velocity to maximum velocity is

**443879616104558**21st August 2018 10:25 AM

### NEET1 NEET1 Physics

## a ball is vertically upward from the ground and a student gazing out of the window sees it moving upward past him at 10 m/s.the window is at 15 m above the ground.the velocity of the ball 3s after it was projected from the ground is

**443879616104558**22nd August 2018 10:47 AM

### NEET1 NEET1 Physics

## a train is approaching a platform with a speed of 10 km/hr.when it is at a distance of 2 km from the platform breaks are applied so that a uniform retardation is produced. at the same time ,a bird sitting on the pole near the platfiorm flies with the speed of 50 km/hr towards the train touches the front of the train and then returns to the pole.if the motion is repeated until the train comes to rast,the total distance travelled by the bird is?

**443879616104558**22nd August 2018 4:06 PM

### CBSE XI Science Physics

## A motorcyclist moving with a uniform retardation takes 10s and 20s to travel successive quarter kilometre.How much further he will travel before coming to rest?

**dineshchem108**23rd August 2018 10:28 PM

### NEET1 NEET1 Physics

## Two ships A and B are 10 km apart on north south. If A ship is due north of B,A travels towards east with velocity 5km/hr. ShipB travels due north with speed 5km/hr. Find the shortest distance between them

**valavanvino1011**26th August 2018 6:12 AM

### CBSE XI Science Physics Motion in a Straight Line

## The 2 ends of train ,moving with a constant acceleration,pass a certain with velocity u and v .Show that velocity with which the middle point of train passes the same point is root of(usquare +v square)/2

**ajaysekharjs**27th August 2018 11:54 AM

### CBSE IX Physics

## A ball is thrown upward with an initial velocity such that it reaches the maximum height of 15m if at the same instant a stone is dropped from the height of 15m find the ratio of their distances travelled when they cross each other

**418222535371723**27th August 2018 9:50 PM

### CBSE IX Physics

## A ball is thrown vertically upwards with a velocity of 49m/s calculate maximum hieght and time taken

**aadhithya.chitti**29th August 2018 6:01 PM

### NEET1 NEET1 Physics

## A man can swim directly a stream of width 100m in 4 minutes, when there in no current of water and in 5minutes when there is current of water. The velocity of the current of water in that stream is

**valavanvino1011**31st August 2018 7:00 AM

### CBSE IX Physics

## Accelaration of a car in a motion is 1.5m/s2 . How much is the increase in a velocity in 4s

**sreekumar1974**3rd September 2018 7:44 PM

### JEE JEE (Main) Physics

## A body is dropped from a building of height 1500 m. After two seconds another body is dropped from the same point. How long after the first body falls will the two bodies be 120 m apart

**abhijithroshan24**8th September 2018 9:24 PM

### NEET1 NEET1 Physics

## give me the expression for ut=1/2at square in physics

**thejuraj2002**18th September 2018 10:37 PM

### CBSE X Physics

## The engineer of a train moving at a speed v1 sights a good train at a distance d ahead of him on the same track moving in the same direction with speed v2. He puts the brakes and gives his train a constant retardation a. There will be no collision if:- a) d ≥ [(v1 - v2)^2]÷2a b) d ≤ [(v1- v2)^2]÷2a c) d = [(v1 - v2)^2]÷2a d) d > [(v1 - v2)^2] ÷2a

**acv27joy**22nd September 2018 2:13 PM

### JEE JEE (Main) Physics

## A body of mass 2kg is projected upward from the surface of the ground at t=0 with a velocity of 20m/s .One second later a body B ,also of mass 2kg is dropped from a height of 20m .If they collide elastically then velocities just after collision are

**m.nilu**22nd September 2018 2:29 PM

### CBSE IX Physics

## A Particle moving with initial velocity of 15 m/s is subjected to a uniform acceleration of -5m/s2. Find the displacement in the next 3 secs.

**bcnandi**23rd September 2018 12:29 PM

### CBSE IX Physics

## A Car travelling at 22.4m/s skids to stop in 2.55 sec.Determine the skidding distance of the car.(Assume uniform acceleration).

**bcnandi**23rd September 2018 1:19 PM

### CBSE XI Science Physics

## Question 2, 3, 4

**Sritam.sen.09**27th September 2018 10:42 PM

### ICSE IX Physics

## solve the following numericals 1. A person is listening to a tone of 5 kilohertz at a distance of 450 m from the source of sound find the time interval between successive compressions from the source of sound. 2. A ball is thrown up vertically and IT returns to the thrower after 12 seconds calculate the velocity with which it is thrown up. g is equal to 9.8 metre per second square 3. A ball is thrown upward with a velocity of 49 M per second calculate the total time it needs to return

**bsap6777**29th September 2018 11:46 AM

### ICSE VII Physics Motion

## A car travels with speed 30km /h for 30mins .and then with speed 40km/h for one hour find the total distance traveled by the car

**qudsia988020**3rd October 2018 9:00 PM

### CBSE XI Science Physics

## A lift coming down with a downward acceleration of 2m/s^2 . A boy standing in the lift throws a stone vertically upwards with speed of 5m/s with respect to himself. The time after which he will catch the stone is?

**arunavamitra50**12th October 2018 12:57 PM

### NEET1 NEET1 Physics

## Initially car x is 4 m ahead of car y. Both start moving at t 0 in same direction along straight line. The velocity-time graph of two cars is shown in figure. The time when car y will catch the car x will be

**rupambhowmikk**3rd November 2018 12:04 AM

### CBSE IX Physics

## A cricket ball is dropped from a height of 20 m. Calculate : (I) speed of ball when it hits the ground (2)time it takes to fall through this height (g=10m/s2)

**nisha_vini29**3rd November 2018 1:04 PM

### CBSE IX Physics

## A stone dropped from roof of the building takes 4s to reach the ground.Calculate the height of the building?

**nisha_vini29**3rd November 2018 1:13 PM

### CBSE IX Physics

## A ball is thrown with a speed of 0.5m/s.(I) how high will it go before it begins to fall? (2)how long will it take to reach that height ?

**Vikas**3rd November 2018 1:26 PM

### CBSE IX Physics

## A ball of mass 50gm is thrown upwards. It rise to a height of 100m. At what height kinetic energy is reduced to 70percent?

**ravinecw**21st November 2018 10:32 AM