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The energy varies with the square of the velocity, so if you need five times the velocity, that's 25 times the energy.

Buzz Aldrin
Squares, Energy, Needs
"Expert testimony on the space age". Q&A with Alan Boyle, www.nbcnews.com. July 19, 2004.
The energy varies with the square of the velocity, so if you need five times the velocity, that's 25 times the energy.