Question

Why is it difficult for a fireman to hold a box which ejects a large amount of water at a high velocity?

Answer 1

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Newton's third law of motion:

Every action has an equal and opposite reaction.
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When the fireman holds the hose, it has an opposite reaction according to the third law of motion. This backward and an equal reaction on the fireman makes him unstable and finds it difficult to hold the hose. Thus, due to the opposite reaction of the water with high velocity a fireman finds it difficult to hold the hose.
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