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N beads identical beads are resting on a...

`N` beads identical beads are resting on a smooth horizontal wire which is circular at the end with radius `r = 0.5 m` as shown in the figure. Find the minimum velocity which should be imparted to the first bead such that `nth` bead will fall in the tank after completing full circle in vertical plane as shown in the figure. Take all the collisions between the beads elastic `(e = 1)`.

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