Where v is the relative speed between the two observers. Just being pedantic cuz it confused me at first when I learned it.
Length contraction is a prediction of Einstein's Special Theory of Relativity. If an observer that is holding a rod measures its length to be L_0, then a different observer moving with velocity v will measure a shorter length L. Note that as v-->c, L-->0 .pic.twitter.com/y1dDIGCaYy
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indeed v is the relative velocity between the observers.
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