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Schinazi · Answer 1 · 2019-08-28T23:59:42+0000

The equation represents height above the ground. we want to know time it takes to hit the ground, so make the equation (height) equal to zero and solve for t.

$0 = - 16{t}^(2) + 120 \\ \\ - 120 = - 16 {t}^(2) \\ \\ 7.5 = {t}^(2) \\ \\ t = 2.7 \: seconds$

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