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9th Class Science Force and laws of motion Question Bank Force and Laws of Motion

  • question_answer
    A body of mass m moving with a constant velocity V hits another body of the same mass moving with the same velocity v but in the opposite direction and sticks to it. The velocity of the compound body after collision is

    A)  V                                           

    B)  2v

    C)  Zero                       

    D)         \[\frac{\upsilon }{2}\]

    Correct Answer: C

    Solution :

     Since the initial momentums of the two bodies are equal and opposite, total initial momentum of the system is zero. So the total final momentum of the system should also be zero. This is possible only if the velocity of the compound body after the collision is zero.


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