When it comes to a basketball player shooting a 3 pointer this is all about physics. When the ball leaves the hand of the shooter the shooter has to decide whether they should use more power from their legs or if they should use more of their arms when they release. As well as when they shoot the ball it is almost as if they have done a small horizontal, vertical equation in their head. As they judge the arc needed for the ball to reach the rim. You also need to know the distance you are shooting from whether a layup where you need less power or a half court shot where you need lots of power. This will also be needed for a 3 pointer because when you shoot the only force acting on your shot on the way down is gravity. This is where the physics exist in shooting a 3 pointer.