A CD Has a Diameter of 12

Multiple Choice

A CD has a diameter of 12.0 cm and is rotating at an angular velocity of 10.0 rad/sec. If the CD has a constant angular acceleration of −0.5 rad/sec², then the angular velocity of the CD after 3.0 sec is

A) 5.7 rad/s.
B) 6.2 rad/s.
C) 7.9 rad/s.
D) 8.5 rad/s.
E) 9.8 rad/s.