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I like @BreakfastBurrito_007's idea and please do not be confused by SI units!
Acceleration is always measured in ms^-2 which is the rate of change of velocity over time. Velocity (in a given direction) is always measured in ms^-1. You cannot convert accleration into velocity because they are not the same thing!
acceleration = change in velocity / time interval
Now in the very particular case of 0ad:
final velocity = initial velocity + acceleration * time (the derivation is trivial and left as an excercise to the reader)
So for 20ms^-2 accleration, the time you need to acclerate a cavalry unit to its maximum speed of 18ms^-1 is:
18 = 0 + 20 * time
time = 0.9 second
Hopefully this can help you to invent more sensible values for the stats