Solve the problem.If a rock is thrown vertically upward from the top of a building 80 feet high with an initial velocity of 64 feet per second, the height, h, above ground level after t seconds is given by h = -16t2 + 64t + 80, where h is in feet and t is in seconds. How many seconds will it take the rock to hit the ground?
A. 1 sec
B. 2 sec
C. 5 sec
D. 4 sec
Answer: C
Mathematics
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A. 
B. 
C. 
D. 
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