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  3. RAJASTHAN PMT

RAJASTHAN PMT Rajasthan - PMT Solved Paper-1995

  • question_answer
    A body of mass in is taken from earth surface to height equal to earth radius R. Then change in its potential energy is:

    A)  \[\frac{mgR}{2}\]           

    B)                         \[mgR\]              

    C)         \[2mgR\]           

    D)         \[\frac{mgR}{4}\]

    Correct Answer: A

    Solution :

    At surface of earth RE. \[U=-\frac{GMm}{R}-mgR\] At a height \[R,U=\frac{-mgR}{2}\] Change \[=-\frac{mgR}{2}-(-mgR)=\frac{mgR}{2}\]


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