Question

Gravel are dropped on a conveyor belt at the rate of 0.5kg/s .The extra force in newton required to keep the belt moving at 2m/s is

Answer 1

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

Answer 2

see correct answer in picture