A Circular Disk of Radius 2

Multiple Choice

A circular disk of radius 2.0 m rotates, starting from rest, with a constant angular acceleration of 20.0 rad/s². What is the tangential acceleration of a point on the edge of the disk at the instant that its angular speed is 1.0 rev/s?

A) 40 m/s²
B) 79 m/s²
C) 110 m/s²
D) 120 m/s²
E) zero m/s²