But I never implied no vertical velocity. It would be possible if you didn't launch perfectly horizontally, right?
---------- Post added at 06:22 AM ---------- Previous post was at 06:15 AM ----------
Nevermind these previous comments.
I now understand my flaw. But still, she dodn't...
I didn't imply zero vertical velocity.
---------- Post added at 06:10 AM ---------- Previous post was at 06:09 AM ----------
Additionally, I don't expect them to go into detail or even list formulas, I just expect them to acknowledge that this is a very precise approximation.
It seems as if many textbooks say that the path of a thrown object is a parabola, and fail to mention it is in fact an elipse with one focus at the center of the earth. I have not yet seen a single textbook in which anything is mentioned of the fact that a parabola only very closely estimates...