Frequently Asked Questions
What is relativistic kinetic energy?
KE = (γ-1)mc², where γ is the Lorentz factor. It diverges as v approaches c.
When should I use this instead of ½mv²?
Above about 0.1c the difference is over 1%; above 0.5c it's enormous.
What is the Lorentz factor?
γ = 1 / √(1 - v²/c²). At rest γ = 1; near c, γ blows up.
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