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36 votes
36 votes
The height "h" of a ball thrown straight up with a velocity of 88 ft/s is given by h = -16t^2 + 88t where "t" is the time it is in the air. For how many seconds the ball is in the air before it hits the ground?

User Mikka
by
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1 Answer

17 votes
17 votes

Answer:

t=5.5

Explanation:

The ball hits the ground when h = 0.


-16t^2 + 88t = 0 \\ \\ 2t^2 - 11t =0 \\ \\ t(2t-11)=0 \\ \\ t=0, 5.5

However, as the answer must be positive, t=5.5

User Joyal
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2.6k points
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