The article cites the falling object rules, which I think do mention velocity. This is from the 2nd edition DM guide: When a character falls, he suffers 1d6 po

The article cites the falling object rules, which I think do mention velocity. This is from the 2nd edition DM guide: When a character falls, he suffers 1d6 points of damage for every 10 feet fallen, to a maximum of 20d6 (which for game purposes can be considered terminal velocity). This method is simple and it provides all the realism necessary in the game, It is not a scientific calculation of the rate of acceleration, exact terminal velocity, mass, impact energy, etc., of the falling body. So accelerating the object (increasing its damage) up to some arbitrary cap sounds reasonable. Perhaps limited to twenty times.