Interesting, but I wouldn't really call it a myth. It feels like quite a nitpick to say that zero air resistance is a valid simplification and that the gravity

Interesting, but I wouldn't really call it a myth. It feels like quite a nitpick to say that zero air resistance is a valid simplification and that the gravity field can be assumed to be unidirectional and constant is not a valid simplification. Certainly when I was taught this I was aware we were making a bunch of assumptions that weren't exactly true.