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9th Class Science Work and energy Question Bank 9th CBSE Science Work and energy

  • question_answer
        Give an example in each case where work done by a force is (a) zero                                (b) positive (c) negative               

    Answer:

       (a) Zero Work done on a stationary body.      (b) Positive When a body falls freely under gravity. (c) Negative When a body is lifted up, the work done by the gravitational force is negative.       


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