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A cement block accidentally falls from rest from the ledge of a 69.6-m-high building. When the...

A cement block accidentally falls from rest from the ledge of a 69.6-m-high building. When the block is 12.4 m above the ground, a man, 2.00 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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Answer #1

To solve time we use the following equation

Where S is neagtive since from point of falling it travels along negative y axis or downward

a is also neagtive since downward

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