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    Question

    Which physical quantity is conserved in a collision (in

    the absence of external forces)?  
    A Force Correct Answer Incorrect Answer
    B Velocity Correct Answer Incorrect Answer
    C Momentum Correct Answer Incorrect Answer
    D Acceleration Correct Answer Incorrect Answer

    Solution

    In any collision, total momentum is conserved if no external force acts.   Momentum p = mv is a vector quantity.   This is based on Newton’s third law.   Energy may not be conserved in inelastic collisions, but momentum is.

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