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NEET NEET SOLVED PAPER 2019

  • question_answer
    The work done to raise a mass m from the surface of the earth to a height h, which is equal to the radius of the earth, is:      [NEET 5-5-2019]

    A) \[\frac{1}{2}mgR\]        

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

    C) \[mgR\]             

    D) \[2mgR\]

    Correct Answer: A

    Solution :

    \[\Delta PE=\frac{GMm}{{{r}_{1}}}-\frac{GMm}{{{r}_{2}}}\]             \[\frac{GMm}{R}-\frac{GMm}{2R}\]             \[\frac{GMm}{2R}-\frac{mgR}{2}\]        


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