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

  • question_answer
    A ball of mass m moves with speed v and it strikes normally with a wall and reflected back normally, if its time of contact with wall is t then find force exerted by ball on wall                                       [BCECE 2005]                     

    A)                         \[\frac{2mv}{t}\]                  

    B)                         \[\frac{mv}{t}\]            

    C)                         \[mvt\]             

    D)                         \[\frac{mv}{2t}\]

    Correct Answer: A

    Solution :

                                For exerted by ball on wall = rate of change in momentum of ball             = \[\frac{mv-(-mv)}{t}=\frac{2mv}{t}\]          


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