A CD Has a Diameter Of $12.0 \mathrm{~cm}$ And Is Rotating at an Angular Velocity Of

A CD has a diameter of $12.0 \mathrm{~cm}$ and is rotating at an angular velocity of $10.0 \mathrm{rad} / \mathrm{sec}$ . If the $\mathrm{CD}$ has a constant angular acceleration of $-0.5 \mathrm{rad} / \mathrm{sec}^{2}$ , then the angular velocity of the $\mathrm{CD}$ after $3.0 \mathrm{sec}$ is

A) $6.2 \mathrm{rad} / \mathrm{s}$ .
B) $9.8 \mathrm{rad} / \mathrm{s}$ .
C) $8.5 \mathrm{rad} / \mathrm{s}$ .
D) $7.9 \mathrm{rad} / \mathrm{s}$ .
E) $5.7 \mathrm{rad} / \mathrm{s}$ .