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  3. a fire hose is turned on the door of a burning bui

A fire hose is turned on the door of a burning building in order to...

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Physics

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A fire hose is turned on the door of a burning building in order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg per second, what is the minimum velocity of the stream needed, assuming the water doesn't bounce back?15 m/s30 m/s20 m/s25 m/s

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