OBJECTS MOVING IN A STRAIGHT-LINE AWAY FROM THE BARYCENTRE

The space circle has shown us the speeds that the external observer (at point C) measured in the case of both objects and which speeds the subjects measured internally in relation to the barycentre (C). So the question emerged, what speed did both objects measure (A, B) in relation to each other?[br][br]This diagram will make it clear again in the easiest way![br][br]more on: [color=#0000ff][url=https://timetheory.net/]www.timetheory.net[/url][/color]