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Question : Sand falls vertically at a rate of 50 kg s^−1 onto a horizon...

Sand falls vertically at a rate of 50 kg {{s}^{-1}} onto a horizontal conveyor belt moving at a speed of 1 m {{s}^{-1}} , as shown in the figure. What is the minimum power output of the engine which drives the belt? How is the work done by the engine accounted for?

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