A volleyball is spiked so that its incoming velocity of $+4.0 \mathrm{~m} / \mathrm{s}$ is changed to an outgoing velocity of $-21 \mathrm{~m} / \mathrm{s}$. The mass of the volleyball is $0.35 \mathrm{~kg}$.
- What impulse does the player apply to the ball?
$[-8.75 \mathrm{~kg}-\mathrm{mi} / \mathrm{s}\}$
