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NEET Sample Paper NEET Sample Test Paper-45

  • question_answer
    Find the work done to take a particle of mass m from surface of the earth to a height equal to 2R -

    A) 2 mg R             

    B) \[\frac{mgR}{2}\]

    C) 3 mg R             

    D) \[\frac{2mgR}{3}\]

    Correct Answer: D

    Solution :

    \[W=\Delta \left( PE \right)=GMm\,\,\left[ \frac{1}{R}-\frac{1}{3R} \right]\] \[=\,\,\frac{2GMm}{R}\,\,=\,\,\frac{2}{3}\,gm\,\,R\]


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