start physics

src/main/java/objects/ships/Submarine.java

@@ -1,18 +1,26 @@
 package objects.ships;
 
 import core.Master;
+import core.Vector2D;
 import objects.GameObject;
 
 import java.awt.*;
 
 public class Submarine extends GameObject {
+
+    public Submarine(Vector2D position, Vector2D size) {
+        super(position, size);
+    }
+
     @Override
     public void draw(Graphics2D g2d, int w, Master master) {
-
+        g2d.setPaint(Color.BLUE);
+        g2d.fillOval((int) (position.x - size.x / 2), (int) (position.y - size.y / 2), (int) size.x, (int) size.y);
     }
 
     @Override
     public void update(Master master) {
-
+        Point mouse = master.getMouseLocation();
+        moveTo(new Vector2D(mouse.x, mouse.y));
     }
 }