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JEE Main & Advanced Physics Gravitation / गुरुत्वाकर्षण Question Bank Gravitation Potential

  • question_answer
    A body of mass m rises to height h = R/5 from the earth's surface, where R is earth's radius. If g is acceleration due to gravity at earth's surface, the increase in potential energy is     [CPMT 1989; SCRA 1996; DPMT 2001]

    A) mgh    

    B)             \[\frac{4}{5}mgh\]

    C)             \[\frac{5}{6}mgh\]     

    D)             \[\frac{6}{7}mgh\]

    Correct Answer: C

    Solution :

                    \[\Delta U=\frac{mgh}{1+h/R}\] Substituting \[R=5h\] we get \[\Delta U=\frac{mgh}{1+1/5}=\frac{5}{6}mgh\]


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