$A$ conveyor belt is moving with a constant velocity $V$. Sand is being dropped on the belt at the rate of $M \text{ kg/s}$. The force necessary to keep the belt moving with a constant velocity $V \text{ m/s}$ will be
- A$MV/2 \text{ N}$
- B$2MV \text{ N}$
- C$0 \text{ N}$
- D$MV \text{ N}$
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