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. .5 rad/s
B. .4 rad/s
C. .3 rad/s
D. .2 rad/s
E. .1 rad/s
