bounce
  
  [Bindable] private var radius:uint = 100;
  [Bindable] private var ball:Sprite = new Sprite();
  [Bindable] private var square:Sprite = new Sprite();
  [Bindable] private var slist:Sprite = new Sprite();
  [Bindable] private var vx:Number;
  [Bindable] private var vy:Number;
  [Bindable] private var bounce:Number = -0.9;
  [Bindable] private var gravity:Number = -0.4;