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DUMET Medical DUMET Medical Solved Paper-2002

  • question_answer
    A body is accelerated from rest by applying a force of 30 N. The momentum of the body after 2 s will be :

    A)  60 kg m/s     

    B)  120 kg m/s

    C)  67.5kg m/s    

    D)  30 kg m/s

    Correct Answer: A

    Solution :

    The impulse \[(F\Delta t)\] given to a body is equal to the change in the momentum \[(\Delta p)\]of the body. i.e., \[\Delta p=F\,\Delta \,t\] Given, \[F=30\,N,\,\Delta t=2s\]. \[\therefore \] \[\Delta p=30\times 2=60\,kg\,m/s\]. Note: Impulse is a vector quantity, its direction is same as that of the force.


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