A slender rod of mass m0 and length l is welded at its midpoint A to the rim of the soli...

A slender rod of mass m₀ and length l is welded at its midpoint A to the rim of the solid circular disk of mass m and radius r. The center of the disk, which rolls without slipping, has a velocity v at the instant when A is at the top of the disk with the rod parallel to the ground. For this instant determine the angular momentum of the combined body about O.