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BCECE Engineering BCECE Engineering Solved Paper-2005

  • 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 the wall.

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

    B)        \[\frac{mv}{t}\]

    C)         \[mvt\]                               

    D)         \[\frac{mv}{2t}\]

    Correct Answer: A

    Solution :

    Initial velocity of ball\[=v\] When it strikes the wall normally and reflected back, then final velocity\[=-v\]         Change in velocity \[=v-(-v)=2v\] Force exerted by the ball on the wall is given by Newtons second law, i.e., \[F=ma\] \[=\frac{m\Delta v}{\Delta t}\] \[=\frac{m(2v)}{t}\] \[=\frac{2mv}{t}\]


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