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JEE Main & Advanced Physics Rotational Motion Question Bank Self Evaluation Test - System of Particles Rotational Motion

  • question_answer
    Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v and 2v at any instant, then the speed of centre of mass of the system will be:

    A) 2v

    B) zero  

    C)  1.5

    D) v

    Correct Answer: B

    Solution :

    [b] If no external force acts on a system of par- ticles, the centre of mass remains at rest. So, speed of centre of mass is zero.


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