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A tennis ball of mass $m$ strikes a wall with a velocity $v$ and retraces the same path. Calculate the change in momentum.
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Verified Answer
The correct answer is:
$-2 m v$
The given situation is shown below
Change in momentum,
$$
\Delta p=p_{f}-p_{i}=m(-v)-(m v)=-m v-m v=-2 m v
$$
Change in momentum,
$$
\Delta p=p_{f}-p_{i}=m(-v)-(m v)=-m v-m v=-2 m v
$$
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