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  5. Work and energy

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

  • question_answer
    When a stone tied to a string is whirled in a circle, what kind of work is said to be done on it by the string?

    A)  Positive           

    B)         Negative

    C)  Zero                  

    D)         Undefined

    Correct Answer: C

    Solution :

     Work done by the centripetal force is zero.


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