A train is moving with velocity 30 m/sec. on this, dust is falling at the rate of 40 kg/min. The extra force required to move this train with constant velocity will be
1
70 N
2
120 N
3
200 N
4
20 N
A train is moving with velocity 30 m/sec. on this, dust is falling at the rate of 40 kg/min. The extra force required to move this train with constant velocity will be