# College Physics 2.21

#### A well-thrown ball is caught in a well-padded mitt. If the deceleration of the ball is $2.10\times 10^{4} m/s^2$, and 1.85 ms $\left(1\:ms=10^{-3}\:s\right)$ elapses from the time the ball first touches the mitt until it stops, what was the initial velocity of the ball?

Solution:

The formula in solving for the initial velocity is

$v_0=v-at$
$v_o=0\:m/s-\left(-2.10\:\times 10^4\:m/s^2\right)\left(1.85\times 10^{-3}\:s\right)$
$v_o=38.85\:m/s$

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