Homework Help: math

Posted by Anonymous on Sunday, March 14, 2010 at 8:49pm.

A baseball is thrown straight up from the rooftop 192 feet high. The function s(t)=16t^2+-64t+192 describes the ball's height above the ground,s(t), in feet, t seconds after it was thrown. How long will it take for the ball to hit the ground? Explain

math - Reiny, Sunday, March 14, 2010 at 11:53pm
Your equation does not make sense, things would be falling upwards

I think it should be
s(t) = -16t^2 + 64t + 192
we want 0 = -16t^2 + 64t + 192
t^2 - t - 12 = 0
(t-4)(t+3) = 0
t = 4 or t = -3 , but t > 0

so t = 4 seconds

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