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Posted by on Thursday, September 6, 2012 at 9:16pm.

A cement block accidentally falls from rest from the ledge of a 52.0 -m-high building. When the block is 11.5 m above the ground, a man, 1.80 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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