I've actually connected the dots. It's all crystal clear now. (even if McCrystal isn't clear wink

You treat velocity and speed as the same thing. I assumed you knew the difference. I completely understand that my words will be contradictory and ridiculous if you go through all my posts and arbitrarily interchange those two terms.

I'm a bit embarrassed to have not noticed this for so long. But also you should have wondered why I kept changing words for the same thing. Surely not just to make my writing look pretty?

A similar problem exists with momentum. Changing direction means changing momentum.