Sand is being dropped on a conveyer belt at the rate of 2 kg per second. The force necessary to keep the belt moving with a constant speed of 3 ms − 1 will be

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Here, rate of fall of sand on conveyer belt, d t d m ​ = 2 kg s − 1 Conveyer belt speed v = 3 ms − 1 Force F = ? F = v d t d m ​ = 3 × 2 = 6 N

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