drag speed/ distance

hey all,
how can i calculate a drag distance or speed to make a sort of power bar, like a billiard cue hitting the ball depending on the drag speed of the billiard cue. thks
how can i calculate a drag distance or speed to make a sort of power bar, like a billiard cue hitting the ball depending on the drag speed of the billiard cue. thks
Comments
http://gshelper.com/?p=255