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JEE Main & Advanced Physics NLM, Friction, Circular Motion Question Bank Second Law of Motion

  • question_answer
    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 [RPET 1999]

    A)                       16.66 N          

    B)                           1000 N          

    C)                         166.6 N          

    D)                           1200 N

    Correct Answer: A

    Solution :

                                \[F=u\ \left( \frac{dm}{dt} \right)=20\times \frac{50}{60}=16.66\,N\]          


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