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Q.

A ball hits a vertical wall horizontally at 10 m/s bounces back at 10 m/s

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a

There is no acceleration because 10 ms− 10ms=0

b

There may be an acceleration because its initial direction is horizontal

c

There is an acceleration because there is a momentum change

d

Even though there is no change in momentum there is a change in direction. Hence it has an acceleration

answer is C.

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Detailed Solution

As the ball bounces back with same speed so change in momentum = 2 mv and we know that force = rate of change of momentum i.e., force will act on the ball so there is an acceleration.
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