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In the 5th edition of Physics, by Resnick, Halliday and Krane,
major changes are made from the previous editions. One of the
most significant is the moving of all discussion of energy to the
end of the mechanics section, where it is used as a unifying
theme. This is, I know, in vogue among physics teachers these
days, and, while I'm not excited by it, I'm not unhappy about it either.
Discussing momentum and collisions before energy does raise a
question, though.