A stone is thrown straight up from the edge of a roof, [math] feet above the ground, at a speed of [math] feet per second.

A. Remembering that the acceleration due to gravity is [math], how high is the stone [math] seconds later?

Answer: feet.

B. At what time does the stone hit the ground?

Answer: sec

C. What is the velocity of the stone when it hits the ground?

Answer: ft/sec.


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