harrylin
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There is no "abrupt" change. Instead, at speed c such a reference frame (even a virtual one) would have (according to us) clocks that do not tick at all (dt'=0) and its rulers would have zero length in the direction of motion; you can't calculate with that.aleemudasir said:Yes to some extent, now I understood the dilemma of this relative velocity taking relativity into account. I have some last questions regarding relativity, do we know the reason why a particle moving @c can't be taken as reference frame and why does the behavior/properties and laws change so abruptly when we move from speed c-1m/s to c? [..]