A 52 kg woman and a 70 kg man stand 20.0 m apart on frictionless ice.
1) How far from the man is their center of mass (CM)?
2) If each holds one end of a rope, and the man pulls on the rope so that he moves 2.4 m, then how far from the woman will he be now?
3) How far will the man have moved when he collides with the woman?