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Question

An object is moving in a straight-line path has a velocity of 40 m/s at some instant. After 5 s, its velocity changed to 30 m/s. What is the average acceleration of the ball during this time interval?

A
2 m/s2
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B
2 m/s2
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C
4 m/s2
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D
4 m/s2
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Solution

The correct option is B 2 m/s2
Average acceleration of the object is given by
¯a=vfvit where, vf is the final velocity of the object, vi is the initial velocity of the object and t is the time taken by object to attain the final velocity from initial.
Hence, average acceleration is given by
¯a=30405=2 m/s2

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