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Ashish sharma Best Answer
The force required to keep the belt moving is equal to the rate of increase of horizontal momentum of the sand. Or, F = rate of change of mass × velocity change => F = (1.5 kg/s)(7 m/s) => F = 10.5 N Now, Power = work done per second => P = force × rate of displacement => P = Fv = (10.5 N)(7 m/s) => P = 73.5 W