A flywheel with a rotational inertia of \(I = 2.0\text{ kg}\cdot\text{m}^2\) rotates about a fixed, frictionless central axis. At time \(t = 0\text{ s}\), the flywheel has an angular velocity of \(+2.0\text{ rad/s}\). A net torque \(\tau\) is exerted on the flywheel along the axis of rotation as a function of time \(t\), as shown in the graph. What is the angular velocity of the flywheel at \(t = 6.0\text{ s}\)?