Sand from a stationary hopper falls onto a moving conveyer belt at a rate of 5 kg/s. The conveyer belt is supported by frictionless rollers. It moves at a constant speed of 0.75 m/s, under the action of constant horizontal external force supplied by a motor that drives the belt find a)  sand rate of change of momentum in horizontal direction. b) the force of friction exerted by the belt on the sand.

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