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

  • question_answer
    Escape velocity on the surface of earth is \[11.2\,km/s\]. Escape velocity from a planet whose mass is the same as that of earth and radius 1/4 that of earth is                  [CBSE PMT 2000; JIPMER 2002; BHU 2004]

    A) 2.8 km/s

    B)               15.6 km/s

    C)             22.4 km/s

    D)               44.8 km/s

    Correct Answer: C

    Solution :

                    \[{{v}_{e}}\propto \frac{1}{\sqrt{R}}\]. If R becomes \[\frac{1}{4}\] then \[{{v}_{e}}\] will be 2 times.


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