Hi can someone help pls

1. Two concentric at disks rotate art a frictionless surface with angular speed mo. Disk 1, which lies on top of the other, has mass M and radius R while disk 2 has twice the mass and twice the radius. A slight disturbance causes the smaller disk to slide to the outer edge of the larger diskI where it sticks. What is the new angular speed of the two disk system in terms of Lug? Figure 1