Special Relativity Theory
According to SR, the vacuum speed of light is isotropically equal to a universal constant c in any coordinate systems. Inter alia, it leads to the fact that
- apart from Newtonian limit, velocities are not additive quantities, and
- the difference velocity between A and B is not equal to their relative velocity and particularly has a smaller absolute value. Whereas the maximum difference speed between two objects is 2c, the maximum absolute value of a relative velocity is equal to c.
To get from and in an arbitrary reference frame, it's necessary to Lorentz transformation the latter into the rest frame of A. If and are collinear, the formula
holds.
Read more about this topic: Relative Velocity
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