An Object Rotates with a Constant Angular Acceleration of 5

Multiple Choice

An object rotates with a constant angular acceleration of 5.0 rad/s², an initial angular speed of -10 rad/s, and a total time of rotation of 4.0 seconds. The average angular velocity has a magnitude of

A) +10 rad/s.
B) +20 rad/s.
C) -10 rad/s.
D) zero.