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  3. 9th Class
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  5. Work and energy

9th Class Science Work and energy Question Bank Work Power and Energy Summative Objective Problems

  • question_answer
    When B falls through\[{{\frac{1}{4}}^{th}}\]of distance from support to ground, his KE could have been (\[\text{g}=\text{9}.\text{8m}/{{\text{s}}^{\text{2}}}\])

    A)  1568 J                  

    B)  1600 J

    C)  4704 J                                  

    D)  6272 J

    Correct Answer: A

    Solution :

      gain in KE = loss in \[PE=mg\,\,(\Delta h)\]          


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