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

By Newton's Third Law, the force at which the water is forced out of the hose has to equal the force which the water pushes back. The principles also apply to momentum, the amount (mass) of water being shot out (velocity) produces a recoil on the hose. To stop the hose from moving, the firefighter has to supply his own force on the hose, and given how much water and how power it is being shot out of the hose, the firefighter must exert a large quanity of force to counter the hose's recoil.

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 When fireman are directing a powerful stream of water on fire from a hose pipe, they have to hold the hose pipe strongly because of its tendency to go backward.the backward movement of the hose pipe is it in the forward direction at a great speed.

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Water comes out at large speeds from the hose, due to newtons third law of motion the water applies a force on the hose which makes the hose to move backwards. so the fireman has to put extra effort to hold the hose.

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