Object B is moving relative to A at the velocity Vb. Object C is moving away from A at Vc. Where Vc > Vb.
This program calculates The velocity U which is the velocity of C relative to B. Vc then can be considered the relativistic addition of Vb and U. In a sense then the formula is a velocity subtraction formula.
Enter velocities Vb and Vc and hit calculate. Vb must be less than or equal to Vc.
All velocities must be entered as fractions of c (between 0 and 1)