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At time $t=0,$ a ball is thrown downward at 24 feet per second from a height of 160 feet above the ground. The equation $h = -16t^2 - 24t +160$ describes the height (in feet) of the ball. In how many seconds will the ball hit the ground? Express your answer as a decimal.

 Jun 27, 2021
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Solve -16t^2 - 24t + 160 = 0

Solutions are t = -3 and t = 7/2

 

We want t to be positive, so t = 3.5.

 Jun 27, 2021

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