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      Question

      The kinetic energy of a body is directly proportional to

      —  
      A Its velocity Correct Answer Incorrect Answer
      B Square of its velocity Correct Answer Incorrect Answer
      C Its mass only Correct Answer Incorrect Answer
      D Its height Correct Answer Incorrect Answer

      Solution

      Kinetic energy KE = 1/2mv2  This shows KE increases quadratically with velocity.   If velocity doubles, KE becomes four times.   Important in dynamics and vehicle safety studies.

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