Calculate the area under the curve of the graph.

If torque and angular displacement are in the same direction, work is positive. If they are in opposite directions, work is negative.

Torque is a rotational force that can transfer energy to or from an object when applied over an angular displacement.

Angular displacement is the angle through which an object rotates.

Work in rotational motion is the energy transferred by a torque acting over an angular displacement.

Moment of inertia is a measure of an object's resistance to changes in its rotational motion.

Rotational kinetic energy is the kinetic energy due to the rotation of an object and is given by $\frac{1}{2}I\omega^2$, where I is the moment of inertia and $\omega$ is the angular velocity.

Positive work: Energy transferred into the system, speeds it up. Negative work: Energy transferred out of the system, slows it down.