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OpenStudy (anonymous):
A ball is dropped from the top of a building has a height of s=144-16t^2 meters after t seconds. How long does it take the ball t reach the ground? What is the ball's velocity at the moment of the impact?
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OpenStudy (tyteen4a03):
The ground's height is (obviously) 0, so substitute s = 0 into the equation and you have your answer.
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