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A pendulum of string length l = 2m and b...

A pendulum of string length l = 2m and bob of mass M Is hit by a bullet with initial velocity u which completely penetrates through it and leaves the bob with velocity `(3u)/4`. If `M/100` is the mass of bullet, then the minimum initial velocity of bullet to make the bob to complete vertical circle is......m/s (`g = 10m//s^2`)

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