er, Phaser.Physics.ARCADE);

            player.body.collideWorldBounds = true;
            player.body.bounce.set(0.9);
            player.body.drag.set(20, 0);

            // Enable input.
            player.inputEnabled = true;
            player.input.start(0, true);
            player.events.onInputDown.add(set);
            player.events.onInputUp.add(launch);
            
            // this tween is to make the camera return to left side of world when done launching
            // so it is not used