What is the minimum velocity with which a body of mass m must enter a vertical loop

What is the minimum velocity with which a body of mass m must enter a vertical loop of radius R so that it can complete the loop?
(a) √5gR
(b) √gR
(c) √2gR
(d) √3gR

Anurag Mishra Professor Asked on 2nd May 2016 in Physics.
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    Answer: (a) sqrt.5gR

    Anurag Mishra Professor Answered on 6th May 2016.
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