A ball of mass $m$ and radius $ r $ is gently released in a viscous liquid. The mass of the liquid displaced by it is $m' $ such that $m > m'$. The terminal velocity is proportional to
  • A$\frac{{m - m'}}{r}$
  • B$\frac{{m + m'}}{r}$
  • C$\frac{{(m + m')}}{{{r^2}}}$
  • D$(m - m') r^2$
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