How much time the man have to get out of the way

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A cement block accidentally falls from rest from the ledge of a 82.4 -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?

Reference no: EM13238393

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