A solid sphere $(I=\frac{2}{5}m{r}^2)$ of mass $m=5kg$ and radius $r=0\mathrm{.}20m$ starts from rest at a height $h=1\mathrm{.}2m$ and rolls without slipping down an incline plane with an angle of $30$ above the horizontal.

$2.$ What is the linear velocity of the disk at the bottom of the incline?

$($A$)1\mathrm{.}67\frac{m}{s}$

$($B$)2\mathrm{.}54\frac{m}{s}$

$($C$)4\mathrm{.}10\frac{m}{s}$

$($D$)5\mathrm{.}81\frac{m}{s}$

$($E$)7\mathrm{.}23\frac{m}{s}$