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  3. CEE Kerala Engineering

CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2009

  • question_answer
    If an object of mass m is taken from the surface of earth (radius R) to a height 2R, then the work done is

    A) \[2mgR\]           

    B)         \[mgR\]

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

    D)         \[\frac{3}{2}mgR\]

    E)  \[\frac{1}{3}mgR\]         

    Correct Answer: C

    Solution :

    Work done \[W=\Delta U=\frac{mgh}{1+\frac{h}{R}}\] Substituting\[h=2R,\]we get                 \[\Delta U=\frac{mg2R}{1+2}\]                 \[\Delta U=\frac{2mgR}{3}\]


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