Increase/Decrease Ball Size

ball.setXY(0, 100); //type commands in console: obj.setXY( horizontal px, vertical px)

ball.throwXY(100, -100) //obj.throw( horizontal px/sec, vertical px/sec )

ball.throwXY(100, 100, 0) //third argument is vertical gravity, default is 100 px/sec^2

Please right click -> inspect -> console and there you can use ball.setXY, ball.getXY and ball.throwXY methods. Refer to the documentation here