I need to think about this issue some more, although you seem to be correct.
Did you make a typo error at the end of your collisions paper?
You wrote -: "Prevent the club from drastically accelerating."
Don't you mean "decelerating"?
Jeff.
Jeff.... Yes... I fixed it now. I need to spell check and edit better. Also I like your approach ... simple documents with out fancy backgrounds etc. In time I'm going to put a bunch of docs on that web site and fix the index.htm page.