Question: A ball is thrown vertically upward with an initial velocity of 64 feet per second. The distance s (in feet) of the ball from the

A ball is thrown vertically upward with an initial velocity of

64 feet per second. The distance s (in feet) of the ball from the ground after t seconds is

s equals 64 t minus 16 t squared

.

(a) At what time t will the ball strike the ground?

(b) For what time t is the ball more than

28 feet above the ground?

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