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A ball is launched into the air from the ground with an initial velocity of $48 \text{ ft/s}$. The ball’s height is given by the equation $s( t ) =-16t ^2+48t \text{ ft}.$ Find the velocity of the ball when it hits the ground.

A

$-48 \ \text{ft/s}$

B

$-96 \ \text{ft/s}$

C

$-144 \ \text{ft/s}$

D

$0 \ \text{ft/s}$

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