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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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