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A bob is attached to one end of a string...

A bob is attached to one end of a string other end of which is fixed at ped `A`. The bob is taken to a position where string makes an angle of `30^(@)` with the horizontal. On the circular path of the bob in vertical plane there is a peg` 'B'` at a symmetrical position with respect to the position of release as shown in the figure. If `V_(c)` and `V_(a)` be the minimum speeds in clockwise and anticlokwise direction respectively, given to the bob in order to hit the peg `'B'` then ratio `V_(c) : V_(a)` is equal to `:`

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