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Explain, why is it difficult for a fireman to hold a hose, which ejects large amounts of water at a high velocity.

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Due to the backward reaction of the water being ejected 

When a fireman holds a hose, which is ejecting large amounts of water at a high velocity, then a reaction force is exerted on him by the ejecting water in the backward direction. This is because of Newton's third law of motion. As a result of the backward force, the stability of the fireman decreases. Hence, it is difficult for him to remain stable while holding the hose. 

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