1. 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 centripetal acceleration of a point 4.0 cm from the center at the time 10.0 seconds from the start? 2. I know constant angular acceleration equations ωf=ωi+αt Also centripetal acceleration= ω^2r I really need some help with this, my professor did not explain this at all. I know radius 0.06m. ωi=5.0rad/sec. The answer to the solution is 1.0 m/s^2 but I'm not sure how to get there.