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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 body of mass 10 kg is dropped to the ground from a height of 10 metres. The work done by the gravitational force is \[(g=9.8\,m/{{\sec }^{2}})\]                                    [SCRA 1994]

    A)             ? 490 Joules

    B)               + 490 Joules

    C)             ? 980 Joules

    D)               + 980 Joules

    Correct Answer: D

    Solution :

                    As the body moves in the direction of force therefore work done by gravitational force will be positive.             \[W=Fs=mgh=10\times 9.8\times 10=980J\]


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