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    Physics
    Grade-7
    Easy

    Question

    Direction : What is the new kinetic energy of an object when its mass becomes
    straight m over 4

    1. KE over 4
    2. KE over 8
    3. 4 KE
    4. 8 KE

    Hint:

    KE/4

    The correct answer is: KE over 4

      KE space equals space 1 half space mv squared straight m to the power of straight prime space equals space straight m over 4 KE to the power of straight prime space equals space 1 half space open parentheses straight m over 4 close parentheses space straight v squared equals space 1 fourth space open parentheses 1 half space straight m squared close parentheses equals space KE over 4

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