If an object is thrown vertically upward from a height of h0 ft with an initial speed of v0 ft/sec, then its height h (in feet) after t seconds is given by
Make use of this formula in working Exercise.
A ball is thrown vertically upward from ground level with an initial speed of 64 ft/sec.
(a) At what time will the height of the ball be 15 ft? (Two answers.)
(b) For how long an interval of time will the height exceed 63 ft?
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