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JEE Main & Advanced Physics Rotational Motion Question Bank Mock Test - Centre of Mass, Conservation of Linear Momentum and Collisions

  • question_answer
    A ball kept in a closed box moves in the box making collisions with the walls. The box is kept on a smooth surface. The velocity of the centre of mass

    A) of the box remains constant

    B)  of the (box + ball), system remains constant

    C)  of the ball remains constant

    D)  of the ball relative to the box remains constant

    Correct Answer: B

    Solution :

    [b]  As no external force acts on the (ball + box) system, hence velocity of the system remains constant.


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