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OpenStudy (anonymous):
A cement block accidentally falls from rest from the ledge of a 82.0 -m-high building. When the block is 19.9 m above the ground, a man, 1.70 m tall, looks up and notices that the block is directly above him. How much time, at most, does the man have to get out of the way?
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OpenStudy (anonymous):
still don't get it :/
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