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Here is a similar (?) situation. If the speed of light in empty
space is DEFINED as 299,792,458 m/s (as in SI since 1983)
then measuring c makes no sense. On the other hand, if we
define distance and time as "what we measure with instruments"
then an experimental determinations of c=d/t makes sense.
Is this a good analogy of the situation encountered in F=m*a?
Ludwik Kowalski