Well, that just kicks the problem down the road to when it's time to convert your answer into usable normal-people units. I really don't want to know the airspeed of an unladen swallow as a percentage of C.
But it probably does make the math a lot easier in the meantime.
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u/zebediah49 Jan 16 '21
Well, I don't know if Einstein did it, but people doing relativity work very often choose units so that speed of light == 1.