# Calculus

A rock is dropped from the top of a 400-foot-tall building. Its distance s (in feet) from the top of the building after t seconds is s(t) = 16t^2. How many seconds will it take the rock to hit the ground?

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1. hit the ground == drop 400 ft. So,

16t^2 = 400
Now just solve for t.

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posted by Steve

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