Fixed ball physics

src/model/objects/Ball.java

@@ -44,12 +44,15 @@ public class Ball {
 			vx = -1;
 		else if (rx <= 0)
 			vx = 1;
+		
+		vy += 0.5;
 
-		if (ry <= (Window.HEIGHT - bounceheight))
-			vy= 4;
-		else if (ry >= (600-size))
-			vy = -4;
-
+//		if (ry <= (Window.HEIGHT - bounceheight))
+//			vy = 4;
+//		else 
+		if (ry >= (600-size))
+			vy *= -1;
+		
 		rx += vx;
 		ry += vy;