A racer who can determine his velocity is able to compare the velocity of his competitors and his past records. Terminal velocity is when the force of gravity equals the drag force, also known as air resistence. When this occurs, the skier has a constant velocity. In skiing, this is known as the fall line. When someone skis down the fall line, it is called schuassing.
Vectors are line segments drawn to represent both the magnitude and the direction of the quantity.
You can add vectors by placing the head of one of the vectors to the tail of another vector. The third vector is the sum of the two vectors, or the resultant. Once the skier knows the velocity of the point when they are either perpendicular or diagonal to the slope of the mountain and the angle of their turn, the skier can then use the tangent of the angle of turn multiplied by the vector quantity of the position vector to figure out the resultant velocity of the turn.