A circular disk of radius 0.010 m rotates with a constant angular speed of 5.0 rev/s. What is the acceleration of a point on the edge of the disk? answer is 9.9 m/s ^2 My attempt: The problem is asking me for the tangential acceleration of the disk. At = rα so to solve the above equation i need the value of α the problem just gave me the velocity , so can i use that velocity in lie of acceleration??? why not!?