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    Physics
    Grade-7
    Easy

    Question

    Direction : What is the new kinetic energy of an object of mass m when its mass becomes
    5 m

    1. 5 KE
    2. KE over 5
    3. 25 KE
    4. KE over 25

    Hint:

    5 KE

    The correct answer is: 5 KE

      KE space equals space 1 half space mv squared straight m to the power of straight prime space equals space 5 straight m KE to the power of straight prime space equals space 1 half space straight m to the power of straight prime straight v squared equals space 1 half space left parenthesis 5 straight m right parenthesis space straight v squared equals space 5 space open parentheses 1 half space mv squared close parentheses equals space 5 space KE

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