public SoccerBall(Vector2D position, double ballSize, double mass, List<Wall2D> pitchBoundary) : base(position, ballSize, new Vector2D(0, 0), -1.0, new Vector2D(0, 1), mass, new Vector2D(1.0, 1.0), 0.0, 0.0) { _pitchBoundary = pitchBoundary; }