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

  • question_answer
    Rahul takes \[1\] minute to raise a box to a height of 1 metre and Rohan takes \[1/2\] minute to do the same. Which of the following is true of the energy spent by the two?

    A)  Energy spent by Rahul is more.

    B)  Energy spent by both Rahul and Rohan is the same.  

    C)  Energy spent by Rohan is more.

    D)  Energy spent by Rahul is less.

    Correct Answer: B

    Solution :

     Energy required\[=mgh\]. In both the cases, \[h\] and \[m\] is the same. Hence, energy spent by both of them is same.


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