A tennis ball hits a vertically wall horizontally at $10 m / s$ bounces back at $10 m / s$

There is no acceleration because

10 \frac{20 m}{s} - 10 \frac{20 m}{s} = 0

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There may be an acceleration becouse its initial direction is horizontal

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There is an acceleration because there is a momentum change

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Even through there is no change in momentum there is a change in direction. hence it has an acceleration

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Solution

The correct option is C There is an acceleration because there is a momentum change
Momentum is a $v e c t o r$ quantity so merely changing $d i r e c t i o n$ ensures change in momentum so $Δ p \neq 0$
so force $F = \frac{Δ p}{Δ t} \neq 0$ so acceleration $a = \frac{F}{m a s s} \neq 0$

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

The correct option is C There is an acceleration because there is a momentum changeMomentum is a vector quantity so merely changing direction ensures change in momentum so Δp≠0so force F=ΔpΔt≠0 so acceleration a=Fmass≠0

A tennis ball hits a vertically wall horizontally at $10 m / s$ bounces back at $10 m / s$

The correct option is C There is an acceleration because there is a momentum change
Momentum is a $v e c t o r$ quantity so merely changing $d i r e c t i o n$ ensures change in momentum so $Δ p \neq 0$
so force $F = \frac{Δ p}{Δ t} \neq 0$ so acceleration $a = \frac{F}{m a s s} \neq 0$