A Lathe, Initially at Rest, Accelerates at 0

Multiple Choice

A lathe, initially at rest, accelerates at 0.60 rad/s² for 10 s, then runs at a constant angular velocity for 20 s, and finally decelerates uniformly for 10 s to come to a complete stop. What is its average angular velocity?

A) 4.5 rad/s
B) 3.5 rad/s
C) 5.0 rad/s
D) 3.0 rad/s
E) 4.0 rad/s