In my code, after checking a condition, I changed the y position of my sprite (a ship). When I do that, the ship does not stay at that position, instead it flies off the screen. The code: answer: function(sprite) { if(sprite.name == "have") { this.bgMusic.stop(); this.bgMusic.loop = false; this.cheer = this.game.add.audio('cheer'); this.cheer.play(); this.ship.y=340; this.text.y=420;}I tried adding this.ship.body.velocity.y=0;this.text.body.velocity.y=0;but it has no effect. What seems to be the issue?