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OpenStudy (anonymous):
A ball is thrown vertically upward from the top of a building 84 feet tall with an initial velocity of 70 feet per second. The distance s (in feet) of the ball from the ground after t seconds is s = 96 + 80t - 16t^2 . After how many seconds will the ball touch the ground?
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OpenStudy (loser66):
let s =0, solve for t
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