Question: A cement block accidentally falls from rest from the ledge of a 7 0 . 4 - m - high building. When the block is

A cement block accidentally falls from rest from the ledge of a 70.4-m-high building. When the block is 17.4 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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