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CBSE Class 9 Answered

Asked by ahujarajesh11 | 20 Jun, 2015, 12:51: PM
answered-by-expert Expert Answer
begin mathsize 12px style Time space taken space by space the space train space to space travel space 30 space km space at space speed space of space 30 space km divided by straight h space is space given space as comma straight v equals straight d over straight t straight t equals straight d over straight v equals fraction numerator 30 space km over denominator 30 space km divided by straight h end fraction equals 1 space straight h Time space taken space by space the space train space to space travel space entire space trip space with space average space speed space 60 space km divided by straight h space is space given space as comma straight t equals fraction numerator 120 space km over denominator 60 space km divided by straight h end fraction equals 2 space hr hence comma space time space taken space to space travel space 90 space km space distace space would space be equals space left parenthesis 2 minus 1 right parenthesis equals 1 space straight h therefore comma space speed space for space 90 space km space equals space 90 over 1 equals 90 space km divided by straight h end style
Answered by Priyanka Kumbhar | 20 Jun, 2015, 02:21: PM

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CBSE 9 - Physics
The average speed of a moving body can never be zero but the average velocity of a moving body can be zero. Justify.
Asked by mailtoparvathyprajith | 06 Feb, 2024, 09:50: PM
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CBSE 9 - Physics
  Arrange the following speeds in increasing order(keeping the least speed first): (i) An athlete running with a speed of 10m/s. (ii) An bicycle moving with a speed of 200m/min. (iii) An scooter moving with a speed of 30km/h
Asked by mailtoparvathyprajith | 06 Feb, 2024, 09:10: PM
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CBSE 9 - Physics
if u is an initial velocity v is final velocity of body and t is time taken by boddy to attain a velocity from u to v then find the value of acceleration A
Asked by Anushkamishra385123 | 14 May, 2023, 12:39: PM
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CBSE 9 - Physics
An object starts from rest and travels 20m in first 2 s and 160 m in 4 s . Find its velocity 7 s after the start .
Asked by asyadav1230 | 20 Dec, 2022, 07:17: AM
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CBSE 9 - Physics
Two points A and B are located on the floor of a room 30cm and 20cm away from a wall. The distance between the points parallel to the wall is 50cm. An insect is at moving on the floor at 5cm/s. It has to first reach a point C on the wall and then reach B such that AC and BC make equal angles with Normal to the wall at C. The time taken for this  motion will be
Asked by rajesh kumar | 21 Oct, 2022, 08:15: PM
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CBSE 9 - Physics
A student starts with a velocity 40 km/hr for school at 4 km away from his house. Due to closing of school he returns soon to his house with a velocity of 60km/hr.His average velocity will be.
Asked by manognabandla2004 | 08 Sep, 2022, 07:55: PM
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CBSE 9 - Physics
a body goes from a to b with a velocity of 20ms and come back from b to a the average velocity of 30ms the average velocity of the body during the whole journey is
Asked by ayushyadav70303 | 12 Jul, 2022, 07:32: AM
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CBSE 9 - Physics
what is vector quantities
Asked by drnaimansari2222 | 11 Jun, 2022, 04:28: PM
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CBSE 9 - Physics
ar Covers 50km in 15 mins and then covers 65km in next 15 mins. calculate it's average speed​
Asked by suzanesharma307 | 30 May, 2022, 11:03: PM
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CBSE 9 - Physics
a car is moving with the acceleration 2m/s from rest find the distance traveled by the car in 10th second
Asked by syedmehdiali543 | 17 Apr, 2022, 04:01: PM
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