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  3. 9th Class
  4. Science
  5. Work and energy

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

  • question_answer
    A man of mass 86 kg climbs 40 steps of a staircase, each measuring \[15\,cm\] high. The potential energy gained by the boy is: \[[g=9.8\,m/{{s}^{2}}]\]

    A) 5000 J              

    B) 5056.8 J

    C) 6000 J  

    D)        500 J

    E) None of these

    Correct Answer: B

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