Speed and direction of motion.
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We're not completely sure what you mean by "per hour per second". Going just by what we see in the question, it's an acceleration, not a velocity. "Six miles per hour north" would be a velocity.
Change in velocity = Velocity at the end of the period minus velocity at the start of the period.
Assuming it's a 4x4 wall, 64 tiles
For the instantaneous value of average velocity, average speed and average velocity are equal.