momentum and it's conservation physics

when a fire hose is hook up to a water supple and the water is turn on the it frequently takes a firefighter to control the hose. why does a fire hose "recoil" when the water is turned on?

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  1. The total momentum of the fireman/hose water remains zero as it was before the water was shot out. Therefore as the water goes right, the hose/fireman goes left.

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