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I gather you are writing that to be real you must directly experience
it without the use of instruments...so a smack in the nose is real.
What then about Africa, or a hallucination...something you alone
experience. Are electrons real, or atoms?
real is tough,
I agree that some notion of position is important, but this isn't a
major stumbling block for most students.
Velocity is important. In particular, the distinction between
velocity and speed becomes important at some point ... but you can
compute KE just fine *before* understanding this distinction.