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A Rock Falls from a Tower That Is 480 Feet h(t)=−16t2+480th(t)=-16 t^{2}+480 t

Question 70

Multiple Choice

A rock falls from a tower that is 480 feet high. As it is falling, its height is given by the function h(t) =−16t2+480th(t) =-16 t^{2}+480 t . How many seconds will it take for the rock to land on the ground?


A) 21.5 seconds
B) 14,400 seconds
C) 21.9 seconds
D) 5.5 seconds

Correct Answer:

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