A ball is thrown straight upward. Suppose that the height of the ball at time t is given by the formula h= -16t2 + 96t, where h is in feet and t is in seconds, with t = 0 corresponding to the instant that the ball is first tossed.
(a) How long does it take before the ball lands?
(b) At what time is the height 80 ft? Why does this question have two answers?
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