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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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