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  3. BCECE Medical

BCECE Medical BCECE Medical Solved Papers-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)  \[\frac{2\,mv}{t}\]

    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.,                 \[F=ma\]                 \[=\frac{m\Delta v}{\Delta t}\]                 \[=\frac{m(2v)}{t}\] \[=\frac{2\,mv}{t}\]


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