anchor.diff:  
       world.collisions.add(paddle1wallCollision);
       world.collisions.add(paddle2wallCollision);
  +
  +    game.keyboard.onKeyDown.where(((e) => e.keyCode == Keys.SPACE)).listen((e) {
  +      ballbody.speed.setValues(100.0, 200.0);
  +    });
     });
   
     game.start();
  
positive.code:     body2.syncFromNode();
  
      var ballbody = new ArcadeBody()
        ..position = new Vector2(400.0, 300.0)
        ..speed = new Vector2(-100.0, 200.0)
        ..restitution = new Vector2(1.0, 1.0)
        ..addTo(world);
  
  
negative.code: main() {
    var game = new GameLoop('#gamebox', width: 800, height: 400);
    game.debug = new DebugDrawer('debuger');
    game.timeScale = 1.0;
  
    var loader = new AssetLoader();
    loader.add('paddle', new ImageAsset('paddle.png'));
    loader.add('ball', new ImageAsset('ball.png'));
  