The dimension of velocity is meter/second, m/s.
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Point, zero; line, one: length but no width
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