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

  • question_answer
    A body falling from a height of \[10\,\,m\] rebounds from a hard floor. It loses \[20%\] of its energy in the impact. What could be the height to which it would rise after the impact?

    A) \[7\,\,m\]                                   

    B) \[5\,\,m\]

    C) \[8\,\,m\]                         

    D)        \[6\,\,m\]

    Correct Answer: C

    Solution :

     \[80%\]of\[mgh=mgh'\] \[\Rightarrow \]\[{{h}^{1}}=\frac{8}{10}\times h=\frac{8\times 10}{10}=8\,\,m\].


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