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A bag of loot is dropped from rest from the top of a building that is 40 m high. From ground level, another bag is thrown straight upward at the same instant that the first bag is dropped. The initial speed of the second bag is exactly the same as that with which the first bag eventually hits the ground. In the absence of air resistance, the motions of the bags are just the reverse of each other. How far above the ground level will the two bags cross path?
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