A cement block accidentally falls from rest from the ledge, Ask an Expert

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Q1. A cement block accidentally falls from rest from the ledge of a 74.8-m-high building. When the block is 18.4 m above the ground, a man, 2.10 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?

Q2. Four identical masses of mass 500 {rm kg} each are placed at the corners of a square whose side lengths are 10.0 {rm cm}.

What is the magnitude of the net gravitational force on one of the masses, by reason of the other three?

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Category:- Physics
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