Why e=mc2?why not e=mc3?

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asked Nov 15, 2018 57.1k views

2 Answers

Jon Catmull · Answer 1 · 2018-11-20T04:31:55+0000

For starters, this question isn’t really about relativity. It’s about energy, and E=mc^2 only makes sense if energy has the units of (mass)*(velocity)^2. So we might as well ask: why is kinetic energy defined as KE = ½*mv^2?

Why e=mc2?why not e=mc3?

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