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Q.

A train is moving with velocity 20 m/sec. on this dust is falling at the rate of 50 kg/minute. The extra force required to move this train with constant velocity will be

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a

1000 N

b

16.66 N

c

1200 N

d

166.6 N

answer is A.

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Detailed Solution

F=udmdt=20×5060=16.66N

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