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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.

Answer :

For the hose to eject water at high velocities, a force must be applied on the water which is usually done with the help of a pump or a motor. Now, the water applies an equal and opposite force on the hose. For the fireman to hold this hose, he must apply a force on it to overcome the force applied on the hose by the water. The higher the quantity and velocity of the water coming out of the hose, the greater the force that must be applied by the fireman to hold it steady.

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