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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 sting of L2, which is initially at rest. Both strings are massless and inextensible. If the second bob, after the collision acquires the minimum speed required to complete a full circle in the vertical plane the ratio L1/L2 is? (integer 1-9)

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