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CMC Medical CMC-Medical VELLORE Solved Paper-2012

  • question_answer
    If a body of mass 10 kg is dropped to the ground from a height of 5 m, then the work done by the gravitational force is (Take g= 9.8 \[m\text{/}{{s}^{2}}\])

    A)  \[+\,490\,J\]                     

    B)  \[-\,490\,J\]

    C)  \[-\,980\,J\]                      

    D)  \[+\,980\,J\]

    Correct Answer: A

    Solution :

                    Since, the body is moving in the direction of force, therefore work done by gravitational force will be positive. Work done, W = F. s = mgh \[=10\times 9.8\times 5=480\,J\]


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