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JEE Advanced 2013 Paper 1

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Question : 18

Total: 60

A bob of mass m, suspended by a string of length l1 is given a minimum velocity required to complete a full circle in the vertical plane, At the highest point, it collides elastically with another bob of mass m suspended by a string of length l2, which is initially at rest. Both the strings are mass-less and inextensible. If the second bob, after collision acquires the minimum speed required to complete a full circle in the vertical plane, the ratio

is

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