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JEE Main & Advanced Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Question Bank Work Done by Constant Force

  • question_answer
     A man starts walking from a point on the surface of earth (assumed smooth) and reaches diagonally opposite point. What is the work done by him               [DCE  2004]

    A)             Zero    

    B)             Positive

    C)             Negative

    D)               Nothing can be said

    Correct Answer: A

    Solution :

                    As surface is smooth so work done against friction is zero. Also the displacement and force of gravity are perpendicular so work done against gravity is zero.


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