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 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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