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Why is it difficult for a fireman to hose, which ejects large amount of water at a high velocity?
According to Newton's Third law of motion, " When a force is applied to an object, the object also exerts the force of same magnitude in the opposite direction." In other words, There is a reaction for every action. This law is also known Newton's law of reaction. In the give figure the force $F$ is applied on a block and the block also exerts the same force in reaction which is denoted by $-F$ and have equal magnitude in the opposite direction.
A hose held by a fireman ejects a large amount of water with a high velocity, in other words the large amount of water is ejected by an exerted force. In reaction the hose also exerts the force of same magnitude in the backward direction. So it becomes difficult for a fireman to hold the hose.
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