A particle is rotated in a vertical circle by connecting it to a string of length 1 and keeping the other end of the

Question

A particle is rotated in a vertical circle by connecting it to a string of length l and keeping the other end of the string fixed. The minimum speed of the particle when the string is horizontal for which the particle will complete the circle is 

(a) √gl  (b) √2gl (c) √3gl (d) √5gl

Answer 1

The correct answer is  (c) √3gl