Mathematics, 29.06.2019 02:00 tdahna0403
Aball is kicked upward with an initial velocity of 56 feet per second. the balls height h (in feet) can be expressed as a function of time t (in seconds) by the equation h=-16t^2+56t. how much time does the ball take to return to the ground
Answers: 1
![\bf h=-16t^2+56t\implies \stackrel{h}{0}=8t(-2t+7) \\\\[-0.35em] ~\dotfill\\\\ 0=8t\implies 0=t\impliedby \textit{when the ball took off from the ground} \\\\[-0.35em] ~\dotfill\\\\ 0=-2t+7\implies 2t=7\implies t=\cfrac{7}{2}\implies t=3\frac{1}{2}\impliedby \textit{down at }3\frac{1}{2}~seconds](/tpl/images/0029/3284/9b39d.png)
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Aball is kicked upward with an initial velocity of 56 feet per second. the balls height h (in feet)...
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