instead of assuming that the velocity c is

Landon Mckinney 2022-05-13 Answered
instead of assuming that the velocity c is a maximal velocity, proving that while assuming E = m c 2 .
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Answers (1)

Superina0xb4i
Answered 2022-05-14 Author has 17 answers
These two concepts are not related at all, so it's not possible to deduce anything either way.
Special relativity in its bare form talks only about space-time, i.e. geometry. You don't have any energy or mass there without first somehow postulating what it is.
For the reverse direction: you can't really deduce anything about SR from E = m c 2 because E and m could be anything (in particular you don't know whether E is a component of a four-momentum p or something completely different). And even if you knew what E and m was that would still give you no clue about what c is (and that it should be constant in every inertial frame).
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