For a two body system with particle 1 of mass mi located at and particle 2 of mass m2 located at 2, find the center of mass r in terms of mi, m2, e1 and 2. (this is not a trick question.) 14. a) show that the change in coordinates of a particle (fixed position) from a small rotation by o around the 2 axis may be written as di=- (2) x . b) optional: show that the change in coordinates d for a small rotation around the axis b by o (b) x may be written da-