How to make sprites that exist only for several seconds and then dissapear and slightly move in place?

Question

Need to create coins that exist for several seconds and then disappear.

The coins are supposed stay in place but move vertically just barely enough to be noticed.

I tried using TranslateTransition for the motion but the coins just disappear.

My class for Coin looks like this.

private Group body;
Circle r0;
Circle inner;
TranslateTransition transy;

public Coin(double x, double y) {

    r0 = new Circle(20.0d);
    inner = new Circle(10.0d);

    r0.setFill(Color.GOLD);
    r0.setStroke(Color.BLACK);
    r0.setStrokeWidth(1.2d);

    inner.setFill(Color.SILVER);
    inner.setStroke(Color.BLACK);
    inner.setStrokeWidth(0.2d);

    this.body = new Group(new Node[]{this.r0, this.inner});
    getChildren().add(body);

    setTranslateX(x);
    setTranslateY(y);


    transy= new TranslateTransition();
    transy = new TranslateTransition(Duration.seconds(1.0d),this.body);
    transy.setFromY(y);
    transy.setToY(y+3);
    transy.setAutoReverse(true);
    transy.setCycleCount(-1);
    transy.play();

}

The main class is supposed to call a constructor for Coin at random and put them in random positions on the edges of the screen.