*61.  ssm A cement block accidentally falls from rest from the ledge of a 53.0-m-high building. When the block is 14.0 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?

The time for the man to react is the difference in time for the block to fall 39.0 m vs the time to fall 51.0 m . 

 

 

The time to fall from rest a distance d is found from

 

Since we are falling from rest we know , and y is d and a is g

 

Solving for t

 

 

 

 

 

 

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This page last updated on January 11, 2020