A disk-shaped merry-go-round of radius 2.33 m and mass 135 kg rotates freely with an angular speed of 0.641 rev/s. A 57.4 kg person running tangential to the rim of the merry-go-round at 3.01 m/s jumps onto its rim and holds on. Before jumping on the merry-go-round, the person was moving in the same direction as the merry-go-round's rim.
What is the final angular speed of the merry-go-round?