Just to clarify, "knots per hour" is the same as saying "1.1 miles per hour per hour". That would in fact be a unit of acceleration, not velocity. So it isn't actually pleonasmic.
For comparison, if you fall off a tall building, you accelerate at 9.81 metres per second per second (or 32 feet per second per second, but only if you're American - that's a joke!).
Having accelerated for some 15 seconds you would achieve a velocity of... wait for it.... zero, because you've just hit the ground - second joke.
