The Summer of String

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:

( 5 g L ) \sqrt(5gL) ( g L ) \sqrt(gL) ( 3 g L ) \sqrt(3gL) ( 2 g L ) \sqrt(2gL)

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