Question

Gravel is dropped in a conveyer belt at a rate of 0•5kg/s.the extra force required in newton to keep the belt moving at2m/s.

Answer 1

The net force should be defined as the rate of change of momentum



here v is constant hence dv/dt is 0

dm/dt= 0.5 kg/sec, v=2m/s

hence extra force required= v*dm/dt = 2*0.5 = 1N

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