A baseball is thrown straight up from the rooftop 192 feet high. The function s(t) = -16t2 + -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?
Are we to assume that the ball is thrown slightly over the edge of the roof?
this is all the question said, so i'm not sure :( can u still try to help?
I'm going to assume yes. This gives us a quadratic equation: 0=-16t^2-64t+192 a.k.a. 0 = t^2+4t-12
The negative solution we can ignore, the positive is your answer.
(t+6)(t-2)=0 Therefore t=2
ok.. thank you
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