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CMC Medical CMC-Medical VELLORE Solved Paper-2009

  • question_answer
    A ball hits a vertical wall horizontally at 10 \[m{{s}^{-1}}\] and bounces back at 10 \[m{{s}^{-1}}\], then

    A)  there is no acceleration because 10ms-1

    B)  there may be an acceleration because its initial direction is horizontal

    C)  there is an acceleration because there is a momentum change

    D)  even though there is no change in momentum there is a change in direction. Hence it has an acceleration

    Correct Answer: C

    Solution :

                    As the ball bounces back with same speed so change in momentum = 2 mv and we know that force = rate of change of momentum ie, force will act on the ball so there is an acceleration.


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