The so-called "terminal velocity" is the fastest that something can fall through a fluid. Even though there's a constant force pulling it through, the friction or resistance of plowing through the surrounding substance gets bigger as the speed grows, so there's some speed where the resistance is equal to the pulling force, and then the falling object can't go any faster.
A few examples: -- the terminal velocity of a sky-diver falling through air, -- the terminal velocity of a pecan falling through honey, -- the terminal velocity of a stone falling through water.
It's not possible to say that "the terminal velocity is ----- miles per hour". If any of these things changes, then the terminal velocity changes too:
-- weight of the falling object -- shape of the object -- surface texture (smoothness) of the object -- density of the surrounding fluid -- viscosity of the surrounding fluid .
