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A bullet of mass m strikes a pendulum bo...

A bullet of mass `m` strikes a pendulum bob of mass `2m` with velocity u es shown in figure. If passes through and emerges but with a velocity `u//2` from bob. The length of the pendulum bob is `l = 2m`. If the minimum value of `u` for which the pendulum bob completes full circle is `10X m//s`, then find `X`.
(Take `g = 10 m//s^(2)`)

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