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  3. 9th Class
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  5. Work and energy

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

  • question_answer
    A block of wood of mass \[250\,\,g\] is moving at a speed of\[4\,\,m\,\,{{s}^{-1}}\]. Find its \[K.E.\] in Joules.

    A) \[4J\]                

    B)        \[2J\]  

    C) \[1J\]                

    D)        \[10J\]

    Correct Answer: B

    Solution :

    \[K.E.=\frac{1}{2}m{{v}^{2}}=\frac{1}{2}\times 0.25\times 16=2\,\,J\]


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