Anyone who moves in any particular direction.
Unlike the drunk on his random walk from the pub! He may use speed - if he can get his head around the concept - but velocity is probably a too much of an ask.
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Yes. Zero velocity is a velocity; if it is always zero then it is a constant velocity.
Well, (final velocity) = (initial velocity) + (acceleration x time)
It equals an undefined entity. The average acceleration of an object equals the CHANGE in velocity divided by the time interval. The term "change in velocity" is not the same as the term "velocity", "average velocity", or "instantaneous velocity".
velocity = distance/time
Velocity is distance / time