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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
    Rakesh lifts a heavy book from the floor of the room and puts it in the book shelf of height\[2\,\,m\]. In this process, he takes \[5\] seconds. On which of the following does the work done by him depend?

    A)  Mass of the book and the time taken to do work

    B)  Weight of the book and the height of the book shelf  

    C)  Height of the book shelf and the time taken to do work

    D)  Mass of the book, height of the book shelf and the time taken to do work

    Correct Answer: B

    Solution :

     Work done \[=mg\times h=\] weight \[\times \] height.


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