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J & K CET Medical J & K - CET Medical Solved Paper-2010

  • question_answer
    The work done in taking an object of mass m from the surface of earth to a height h = R, where R is the radius of the earth, is

    A)  mgR                                     

    B) \[\frac{1}{2}mgR\]

    C) \[\frac{1}{3}mgR\]                                          

    D) \[\frac{2}{3}mgR\]

    Correct Answer: B

    Solution :

                     Work done \[=\Delta U=\frac{mgh}{1+\frac{h}{R}}\] \[\frac{mg\times R}{1+\frac{R}{R}}=\frac{mgR}{2}\]


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