Angular Acceleration Problem?

Bob walks around the edge of a circular merry-go-round of radius 1 meter. The merry-go-round rotates underneath him at (omega)=0.5V+2 where V is the speed at which Bob walks. How fast and in what direction (ccw or cw) must Bob walk for his total acceleration (coriolis, centripetal, and transverse) to be zero as seen by an outside observer?