solution

src/main/java/lab/Bullet.java

+package lab;
+
+import javafx.geometry.Point2D;
+import javafx.scene.canvas.GraphicsContext;
+import javafx.scene.paint.Color;
+
+public class Bullet {
+
+	private Point2D position;
+	
+	private Point2D speed;
+		
+	private Point2D acceleration;
+
+	public Bullet(Point2D position, Point2D speed, Point2D acceleration) {
+		this.position = position;
+		this.speed = speed;
+		this.acceleration = acceleration;
+	}
+
+	
+	public void draw(GraphicsContext gc) {
+		gc.save();
+		gc.setFill(Color.SILVER);
+		gc.fillOval(position.getX(), position.getY(), 10, 10);
+		gc.restore();
+	}
+	
+	public void simulate(double deltaT) {
+		position = position.add(speed.multiply(deltaT));
+		speed = speed.add(acceleration.multiply(deltaT));
+	}
+	
+}

src/main/java/lab/BulletAnimated.java

+package lab;
+
+import javafx.geometry.Point2D;
+import javafx.scene.canvas.GraphicsContext;
+import javafx.scene.image.Image;
+
+public class BulletAnimated {
+
+	
+	private final Image image = new Image(this.getClass().getResourceAsStream("fireball-transparent.gif"));
+	
+	
+	private Point2D position;
+	
+	private Point2D speed;
+		
+	private Point2D acceleration;
+
+	public BulletAnimated(Point2D position, Point2D speed, Point2D acceleration) {
+		this.position = position;
+		this.speed = speed;
+		this.acceleration = acceleration;
+	}
+
+	
+	public void draw(GraphicsContext gc) {
+		gc.drawImage(image, position.getX(), position.getY(), 40, 40);
+		
+	}
+	
+	public void simulate(double deltaT) {
+		position = position.add(speed.multiply(deltaT));
+		speed = speed.add(acceleration.multiply(deltaT));
+	}
+}

src/main/java/lab/Cannon.java

+package lab;
+
+import javafx.geometry.Point2D;
+import javafx.scene.canvas.GraphicsContext;
+import javafx.scene.paint.Color;
+import javafx.scene.transform.Affine;
+import javafx.scene.transform.Transform;
+
+public class Cannon {
+	private Point2D position;
+	
+	private double angle;
+
+	public Cannon(Point2D position, double angle) {
+		this.position = position;
+		this.angle = angle;
+	}
+	
+	public void draw(GraphicsContext gc) {
+		gc.save();
+		gc.setFill(Color.LIGHTSTEELBLUE);
+		gc.transform(new Affine(Transform.rotate(angle, position.getX(), position.getY())));
+		gc.fillRect(position.getX(), position.getY(), 60, 20);
+		gc.restore();
+	}
+	
+	public void simulate(double deltaT) {
+		angle += 15*deltaT;
+	}
+	
+}

src/main/java/lab/DrawingThread.java

@@ -7,10 +7,15 @@ import javafx.scene.canvas.GraphicsContext;
 public class DrawingThread extends AnimationTimer {
 
 	private final GraphicsContext gc;
-	private long lastTime;
+	private final World world;
+	private final double height;
 
+	private long lastTime;
+	
 	public DrawingThread(Canvas canvas) {
 		this.gc = canvas.getGraphicsContext2D();
+		this.world = new World(canvas.getWidth(), canvas.getHeight());
+		this.height = canvas.getHeight();
 	}
 
 	/**
@@ -21,9 +26,15 @@ public class DrawingThread extends AnimationTimer {
 		if (lastTime > 0) {
 			double deltaT = (now - lastTime) / 1e9;
 			// call simulate on world
+			world.simulate(deltaT);
 		}
 		//call draw on world
+		gc.save();
+		this.gc.scale(1, -1);
+		this.gc.translate(0, -height);
+		world.draw(gc);
 		lastTime= now;
+		gc.restore();
 
 	}
 

src/main/java/lab/World.java

+package lab;
+
+import javafx.geometry.Point2D;
+import javafx.scene.canvas.GraphicsContext;
+import javafx.scene.paint.Color;
+
+public class World {
+	
+	
+	private final double width;
+	private final double hight;
+	private final Bullet bullet;
+	private final BulletAnimated bullet_2;
+	private final Cannon cannon;
+
+	public World(double width, double hight) {
+		this.width = width;
+		this.hight = hight;
+		//create bullet and assign to instance variable
+		this.bullet = new Bullet(new Point2D(0, 0), new Point2D(30, 30), new Point2D(0, -9.81));
+		this.bullet_2 = new BulletAnimated(new Point2D(0, 0), new Point2D(40, 70), new Point2D(0, -9.81));
+		this.cannon = new Cannon(new Point2D(0, 0), 45.0);
+	}
+
+	
+	public void simulate(double deltaT) {
+		//call simulate on bullet
+		bullet.simulate(deltaT);
+		bullet_2.simulate(deltaT);
+		cannon.simulate(deltaT);
+	}
+	
+	public void draw(GraphicsContext gc) {
+		gc.setFill(Color.BEIGE);
+		gc.fillRect(0, 0, width, hight);
+		//call draw on bullet
+		bullet.draw(gc);
+		bullet_2.draw(gc);
+		cannon.draw(gc);
+	}
+	
+}
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