A solid sphere with mass, $M,$ and radius, $R,$ rolls along a level surface without slipping with a linear velocity, $v.$

What is the ratio of rotational to linear kinetic energy?

$($For a solid sphere, $I=0\mathrm{.}4M{R}^2).$

$\frac{1}{4}$

$\frac{1}{2}$

$1/1$

$\frac{2}{5}$