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The height of a golf ball hit off a 128-foot cliff is modeled by the function h(t) = −16t^2 + 32t + 128, where h is height in feet and t is time in seconds. Find the time the golf ball takes to reach the ground.

 Feb 11, 2021
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Set h = 0, (because the ground is at zero height here) then solve the quadratic -16t2 + 32t + 128 = 0 for t.  There will be two values, one negative and one positive.  Take the positive value.

 Feb 11, 2021

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