Upgrade to access all content for this subject

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.

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

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

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

$0 \ \text{ft/s}$