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Railways RRB (Assistant Loco Pilot & Technician) Solved Paper-2 (2014)

  • question_answer
    The escape velocity of a sphere of mass m from Earth having mass M and radius R is given by

    A)  \[\sqrt{\frac{2GM}{R}}\]                 

    B)  \[\sqrt{\frac{GM}{R}}\]

    C)  \[\sqrt{\frac{2GmM}{R}}\]              

    D)  \[\sqrt{\frac{GM}{R}}\]

    Correct Answer: A

    Solution :

    \[\frac{1}{2}m{{v}^{2}}-\frac{GmM}{R}=0\] Hence,    \[v=\sqrt{\frac{2GM}{R}}\]


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