A 55-kg woman and an 80-kg man stand 10.0 m apart on frictionless ice.
(a) How far from the woman is their CM?
(b) If each holds one end of a rope, and the man pulls on the rope so that he moves 2.5 m, how far from the woman will he be now?
(c) How far will the man have moved when he collides with the woman?