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A ball is thrown vertically upward with an initial velocity of 48 feet per second.

A ball is thrown vertically upward with an initial velocity of 48 feet per second. The distances (in feet) of the ball from the ground after t seconds is s=48-16t2

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

(b) For what time t is the ball more than 32 feet above the ground?

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Answer #1

Hence answer a) is 3 second and answer b) is 1 second.

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