A) there is no acceleration because\[10m{{s}^{-1}}-10m{{s}^{-1}}=0\]
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
Correct Answer: C
Solution :
As the ball bounces back with same speed so change in momentum\[=2mv\]and we know that force = rate of change of momentum ie, force will act on the ball so there is an acceleration.
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