A Disk of Moment of Inertia 80 Kg

Multiple Choice

A disk of moment of inertia 80 kg.m² is free to rotate about its axis (through the center, perpendicular to the plane of the disk, which is set vertical) . To increase its angular velocity uniformly from rest to 5.0 rad/s in 20.0 s, the work done by the applied torque is

A) 1.0 * 10³ J.
B) 4.0 F*10² J.
C) 2.0 * 10² J.
D) 3.2 J.
E) 1.6 J.