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John V Jackson replied to James Cunningham:
> >They're using the mathematical description of work. No vertical
> >vertical work. That doesn't mean no energy has been expended.
> I was aware of that, though isn't it a "physic"-al description?
> Since work is force times speed...
Work is the amount of energy changed from one form to another (i.e.
expended). It doesn't have a direction. When an object moves, work
is equal to force times distance.
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