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Question: a small rock is thrown vertically upward with a speed...

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A small rock is thrown vertically upward with a speed of 23.0 m/s from the edge of the roof of a 39.0-m-tall building. The rock doesn't hit the building on its way back down and lands in the street below. Ignore air resistance. What is the speed of the rock just before it hits the street? How much time elapses from when the rock is thrown until it hits the street?

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