A heavy flywheel rotating on its central axis is slowing down because of friction in its bearings.

Question:

A heavy flywheel rotating on its central axis is slowing down because of friction in its bearings. At the end of the first minute of slowing, its angular speed is 0.900 of its initial angular speed of 250 rev/min, assuming a constant angular acceleration, find its angular speed at the end of the second minute.