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A rock is thrown vertically upward with a speed of 14.0m/s from the roof of a building that is 70.0m above the ground. Assume free

A rock is thrown vertically upward with a speed of 14.0m/s from the roof of a building that is 70.0m above the ground. Assume free fall A) In how many seconds after being thrown does the rock strike the ground? B) What is the speed of the rock just before it strikes the ground

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