A disk-shaped merry-go-round having radius 2.63 m and mass 185 kg rotates freely with the angular speed of 0.631 rev/s. A person of 56.4 kg running tangential to the rim of the merry-go-round at 3.21 m/s jumps onto its rim and holds on. Before jumping on the merry-go-round, the person was moving in the similar direction as the merry-go-round's rim.
Determine the final angular speed of the merry-go-round?