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

  • question_answer
    A body moves under a variable force. For the body a plot of velocity versus time is shown in figure. The correct statement is

    A) In moving from C to D, work done by the force on the body is positive

    B) In moving from 6 to C, work done by the force on the body is positive

    C) In moving from A to B, the body does work on the system

    D) In moving from O to A, work done by the body and is negative.

    Correct Answer: A

    Solution :

    In moving from C to D, slope of graph is negative which means acceleration (force) is negative and displacement is also negative as the area under curve CD lies below the time axis. Hence, work done by the force on the body is positive.


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