Sand is deposited at a uniform rate of $20 \ kg/s$ and with negligible kinetic energy on an empty conveyor belt moving horizontally at a constant speed of $10 \ m/min$. Find the force required to maintain the constant velocity of the conveyor belt.
- A$10/3 \ N$
- B$10/4 \ N$
- C$1/4 \ N$
- D$5/4 \ N$
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