a train is moving with a velocity of 20m/s.on this dust is falling at the rate of 50kg/minute. The extra force required to move this train with constant velocity will be(a)16.66N(b)1000N(c)166.6N(d)1200N
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F=v x dm/dt
= 20 x 50/60
= 50/3
=16.67N
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