Classical Mechanics
In the Newtonian limit where approximately the Galilean transformation
holds, it is identical with the vector difference between the velocities of A and B, as evaluated in terms of a single coordinate system:
- .
Due to Einstein's Special Relativity (SR), doesn't hold in general. The expression "the velocity of A relative to B" is shorthand for "the velocity of A in the coordinate system where B is always at rest".
Read more about this topic: Relative Velocity
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