Question

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

Answer 1

 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.

Answer 2

It is because when the water flows in forward direction at a high velocity it exerts a equal force in opposite direction i.e backward making it

difficult for fireman to hold the pipe.