Steven Sesselmann wrote:
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Up = Fdr = mc^2
…snip…
This is not how relativistic force works at all. Equation for total kintetic energy from wikipedia, which at low velocities approximates F*dr. Now, I don’t know if this is “backyard lab” verifiable, but it’s been experimentally tested since 1908. E = MC^2 was Einstein’s rest mass formula, not total energy formula. This is Physics 101 stuff.