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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2005

  • question_answer
        The kinetic energy needed to project a body of mass m from the earths surface (radius R) to infinity is:

    A)  \[mgR/2\]        

    B)  \[2mgR\]

    C)  \[mgR\]                              

    D)  \[mgR/4\]

    Correct Answer: C

    Solution :

                    The kinetic energy required to project a body of mass m from earths surface to infinity is known as escape energy. Therefore, \[K.E.=\frac{G{{M}_{e}}m}{R}\] \[=mgR\]                             \[\left( \because gR=\frac{G{{M}_{e}}}{R} \right)\]


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