NEET Sample Paper NEET Sample Test Paper-34

  • question_answer A particle falls towards the earth from infinity its velocity on reaching the earth would be-

    A)  Infinite    

    B)  \[{{(gR)}^{1/2}}\]       

    C)  \[{{(2gR)}^{1/2}}\]

    D)  gR          

    Correct Answer: C

    Solution :

    Apply  C.O.M.E. T.E. at surface = T.E. at infinity \[\frac{-GMm}{R}+\frac{1}{2}m.{{V}^{2}}=0\] \[\Rightarrow \,V=\sqrt{\frac{2GM}{R}}=\sqrt{2gR}\]

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