The [DiFFERENCE] between SPEED and VELOCiTY:
$$ o o o o
$$ o o o vector
$$ o o o PROjECTiON
$$ A--------VELOCiTY vector v--B - - - - - - C
$$ o o o
$$ o o o
$$ o o ..ANY actual PATH o
$$ GUESS *SPEED* is CLEARLY, (..ANY actual PATH) / DURATiON.
$$ VELOCiTY v is ANY measured or imagined VECTOR / DURATiON.
$$ [CLEARLY, POSiTiON B is an ARBiTRARY point, ON the PATH].
$$ Any OTHER 2 points on the *SAME path* a DiFFERENT VECTOR.
$$
$$ "Heisenberg was NOT WRONG ..just because he got caught, too often
$$ ..trying to (focus) on BOTH ENDs of a velocity vector ..at ONCE".

Sue... "Vectors". [ Speed vs velocity.] End of POST.