A horizontal uniform circular disk has a mass 2 m. The disk is free to rotate about the z axis and initially at rest. A man having mass m begins to run along the edge in a circular path whose radius is approximated to be R. If he maintains a speed of v0 relative to the disk, what is the angular velocity of the disk? Neglect friction. v0/R v0/(2R) 3v0/(2R) 2v0/(3R) v0/(3R)