Tuesday 25 September 2018

special relativity - Why is the relative speed between two inertial frames the same for observers in each frame?


Consider two frames $S$ and $S'$, moving relative to each other. If I stand still in frame $S$ and watch frame $S'$, I can measure its speed to be $V$. However, why is this speed the same as the observer in $S'$ measured for $S$? (denote as $V'$?)




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