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The SI unit of acceleration or de-acceleration is:

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Important Questions on Motion

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Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 13
The velocity of a body increases from 2 m s-1 to 12 m s-1 in 5 s. The acceleration of the body is:
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Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 14
Velocity of a body represents
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Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 15
When a body is projected upward, the acceleration acting on it is:
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Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 16
Which one is an example of an accelerated body, moving with a uniform speed.
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Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 17

The table below shows the speed of moving vehicle with respect to time.

Speed (m/s) : 2   4    6     8     10
Time (s) : 0     2  3   4 5

The acceleration of the vehicle is:
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Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 18
A ball dropped from a height 'h' reaches the ground in time T. The height of the ball at the time T/2 is:
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Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 19
Rahul while driving to school, computes the average speed of his trip to be 20 km h-1. On his return trip along the same route, there is less traffic and average speed is 40 km h-1. The average speed of Rahul’s round trip is:
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Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 20

Keshav jogs from end A to another end B of the straight road in 2 min 30 sec and then turns around and jogs 100 m back to the point C in one minute. The average speed of jogging from point A to B is : 

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