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

  • question_answer
    A body of mass M collides against a wall with a velocity V and rebounds with the same speed. Its change of momentum is

    A)  zero                     

    B)         \[MV\]

    C)  \[-2MV\]                             

    D)  \[-MV\]

    Correct Answer: C

    Solution :

     Initial momentum\[=MV\] Final momentum\[=-MV\] Change in momentum \[=\]Final momentum \[-\] initial momentum                                      \[=-MV-MV=-2MV\]


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