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JIPMER Jipmer Medical Solved Paper-2002

  • question_answer
    A particle falls from infinity to the earth. Its velocity on reaching earth of radius R is:

    A)  \[2Rg\]                               

    B)  \[Rg\]                  

    C)  \[\sqrt{Rg}\]                    

    D)         \[\sqrt{2Rg}\]

    Correct Answer: D

    Solution :

    At infinity, potential energy of the particle is zero. When it approaches to earth, its potential energy\[=-\,mgR.\]. This difference in potential energy \[mgR=\frac{1}{2}m{{\upsilon }^{2}}\] So,                          \[\upsilon =\sqrt{2Rg}\]


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