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9th Class Science Work and energy Question Bank Work, Energy and Power

  • question_answer
    Calculate the kinetic energy of a body of mass \[10\,\,kg\] moving with a velocity\[2\,\,m\,\,{{s}^{-1}}\].

    A) \[40\,\,J\]                                  

    B) \[20\,\,J\]  

    C) \[30\,\,J\]                      

    D)        \[10\,\,J\]

    Correct Answer: B

    Solution :

    \[K.E.=\frac{1}{2}M{{V}^{2}}=\frac{1}{2}\times 10\times {{(2)}^{2}}=\frac{1}{2}\times 10\times 4\]\[=20\]joule


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