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# Motion Free Doubts and Solutions

## A boy on a 78.4m high cliff drops a stone. One second later, he throws another stone downwards with some speed. The two stones reach the ground simultaneously. Find the speed with which the second stone was thrown.   (Acceleration due to gravity = 9.8 m/s2)

Asked by arunk.agarwal 30th July 2016, 4:15 PM

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## Is there any difference between accelerated motion and uniform acceleration?Explain your answer with examples?

Asked by abinash.gupta003 15th July 2016, 10:44 AM

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## An object covers half the distance with a speed of 20m/s and the other half with a speed of 30m/s. Calculate the average speed of the whole journey.

Asked by manhas 13th June 2016, 7:06 PM

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## Sir/Ma'am,please give an example for each as I have to make a working model on motion. 1-Circulatory motion 2-uniform and non uniform motion 3-Rotatory motion 4-Oscillatory motion 5-Rectilinear motion

Asked by Shawn 2nd June 2016, 7:56 PM

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## A train starting from rest moves with a uniform acceleration of 0.2 m/s 2 for five minutes.Calculate the speed acquired and the distance travelled in this time.                         From a station ‘X’ a train starts from rest and attains a speed of 54 km/h in 10 s, then with this uniform speed it moves for 8 minutes and then by applying brakes it stops at station ‘Y’ in 6 s.Find the distance between station ‘X’ and ‘Y’.   Draw a position-time graph and a speed-time graph for a ball thrown vertically upwardswhich comes to rest on reaching the ground.   If a ball hits the ground with velocity ‘v’, it bounces back up with velocity ‘v’. If sucha ball is dropped from a height ‘h’ above the ground, how high will it bounce ? Justify your answer.   Why does (second) 2 occurs in the unit of acceleration ?   A body moving with a velocity of 2 m/s acquires a velocity of 10m/s in 5s. Find its acceleration.   When can we say the motion of an object as uniform motion ? What can be the shape of thepath covered by a moving object to have uniform speed and uniform velocity ?

Asked by arunk.agarwal 25th May 2016, 8:43 AM

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## A body travels along a circular path of radius 70 cm,after travelling half a revolution in 20 seconds. Find the average velocity and the average speed.

Asked by Shawn 1st May 2016, 1:19 AM

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## AN ABJECT IS DROPPED FROM REST AT A HEIGHT OF 150 M AND SIMULTANEOUSLY ANOTHER OBJECT IS DROPPED FROM REST AT A HEIGHT OF 100 M.WHAT IS THE DIFFERENCE IN THEIR HEIGHTS AFTER 2 SECONDS,IF BOTH THE OBJECTS DROP WITH SAME ACCELERATIONS? HOW DOES THE DIFFERENCE IN HEIGHTS VARY WITH TIME?

Asked by vrishti TOKAS 19th July 2015, 9:33 AM

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## A ball is dropped on to the floor from a height of 10 cm. It rebounds to a height of 2.5m. If the ball is in contact with the floor for o.o1 seconds , what is the average accelerationduring contact ??

Asked by SIDDHARTH SHARMA 24th November 2014, 11:12 AM

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## A particle is moving in a straight line with initial velocity U and uniform accerleration A. if the sum of distances travelled in Tth & (T+1)th second is 100 cm. Then find its velocity after T second in cm/s

Asked by SIDDHARTH SHARMA 24th November 2014, 11:08 AM

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## A train starts from a station P witha uniform acceleration A1, for some distance and then goes with uniform retardation A2 for some more distance to come at rest at the station Q. The distance between stations P & Q is 4km and the train takes 4 min. to complete the journey , then 1/A1+1/1A2  =

Asked by SIDDHARTH SHARMA 24th November 2014, 11:03 AM