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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, by applying horizontal velocity ν 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 ______.

1. 2
2. 1
3. 4
4. 3

Correct answer: 2

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