A bob of mass m is suspended at a point O by a light string of length l and left to perform vertical motion (circular) as shown in figure. Initially,…

A bob of mass m is suspended at a point O by a light string of length $\displaystyle l$ and left to perform vertical motion (circular) as shown in figure. Initially, by applying horizontal velocity $\displaystyle v_0$ at the point 'A', the string becomes slack when, the bob reaches at the point ' D '. The ratio of the kinetic energy of the bob at the points B and C is $\displaystyle \_\_\_\_$.