$A$ bullet of mass $m$ and velocity $v$ strikes the bob of a pendulum of mass $M$ and emerges out with velocity $v/2$. What is the minimum value of $v$ such that the bob of the pendulum will swing through a complete circle? (Take the length of the pendulum $= \ell$)

  • A
    $\frac{M}{m} \sqrt{2\ell g}$
  • B
    $\frac{2M}{m} \sqrt{2\ell g}$
  • C
    $\frac{M}{2m} \sqrt{5\ell g}$
  • D
    $\frac{2M}{m} \sqrt{5\ell g}$

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