The valve of a cylinder containing 15 kg of compressed gas is opened and the cylinder empties in 1min 20s. If the force exerted on the cylinder 4.0 N,   show that the force required to accelerate the gas out of the cylinder is equal to (the change in momentum  )  divided by  ( the time taken)   Find   (i)  the average velocity at which the gas issues from the exit nozzle of the cylinder             (ii) the change in momentum of the gas

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