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AMU Medical AMU Solved Paper-2002

  • question_answer
    The gravitational potential energy of a body at a distance r from the centre of the earth is U, then its weight at that point is

    A)  \[\frac{U}{{{r}^{2}}}\]                                  

    B)  \[\frac{U}{r}\]

    C)  \[Ur\]                                  

    D)  \[U{{r}^{2}}\]

    Correct Answer: B

    Solution :

                     Weight of a body depends upon acceleration due to gravity (g). It is given by                 W = mg                                 ... (i) Also, gravitational potential energy                 U = mgr                                                ... (ii) From Eqs. (i) and (ii), we get                 \[W=mg=\frac{U}{r}\]


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