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9th Class Science Work and energy Question Bank Work, Energy and Power

  • question_answer
    In question No. 80, if the lift is moving upwards with a uniform velocity then the frictional resistance offered by the body is

    A)  \[Mg\]                

    B)         \[\mu Mg\]  

    C)  \[2\mu Mg\]            

    D)         zero

    Correct Answer: B

    Solution :

     For motion of the lift with uniform velocity,\[R=mg\] because the acceleration is zero. So, frictional force\[=\mu R=\mu mg\].


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