phaser 2.0-2.0.1 movement problem

var game = new Phaser.Game(400, 490, Phaser.AUTO, 'game_div');

var main_state = {

    preload: function() {
      this.game.load.image('test', 'bird.png');
    },

    create: function() {
      this.game.physics.startSystem(Phaser.Physics.ARCADE);
      this.bird = this.game.add.sprite(100, 245, 'test');
      this.game.physics.enable(this.bird, Phaser.Physics.ARCADE);
      this.game.input.onDown.addOnce(this.move_it, this);
    },

    move_it: function() {
      //this.bird.body.x = 105; // this line works on 2.0 not in 2.0.1
      this.bird.x = 105; // this lines moves it in 2.0.1 but doesn't stop in 105, keeps velocity
    }

};

// Add and start the 'main' state to start the game
game.state.add('main', main_state);
game.state.start('main');