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# Ed hits a shot off the tee that has a height modeled by the function f(t) = -16t2 + 112t. How long is the ball in the air?

### 2 Answers

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- AlanLv 71 month agoFavorite Answer
it hits the ground when f(t) =0

f(t) = -16t^2 + 112t

factor

f(t) = -16t( t-7)

-16t = 0 seconds

t = 0

(t-7) =0

t = 7 seconds

so 7 seconds

- JimLv 71 month ago
The height is -16t² + 112t, and we want 0 feet.

0 = -16t² + 112t

0 = -16t (t - 7)

t must then be 0 or 7 sec to be at ground level.

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