A CD with a Diameter of 12

Multiple Choice

A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 rad/sec² acquires an angular velocity of 5.0 rad/sec.The CD continues rotating at 5.0 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration.What is the tangential velocity of a point 4.0 cm from the center at the time 10.0 seconds from the start?

A) 0.50 rad/s
B) 0.40 rad/s
C) 0.30 rad/s
D) 0.20 rad/s
E) 0.10 rad/s