diff --git a/src/scenes/game.py b/src/scenes/game.py
index 28503a2..960d266 100644
--- a/src/scenes/game.py
+++ b/src/scenes/game.py
@@ -210,7 +210,7 @@ def __angle_to_vec2(angle_degrees: float, magnitude: float):
     x = magnitude * math.cos(angle_radians)
     y = magnitude * math.sin(angle_radians)
 
-    return x, y
+    return Vec2(x, y)
 
 
 def __spawn_ball(world: World):
@@ -218,6 +218,10 @@ def __spawn_ball(world: World):
     angle = random.randint(0, 360)
     velocity = __angle_to_vec2(angle, 200)
 
+    # mouvement a droite ou a gauche
+    if random.randint(0, 1) == 0:
+        velocity.x = -velocity.x
+
     # Balle
     world.new_entity().set(
         SpriteBundle(
@@ -229,7 +233,7 @@ def __spawn_ball(world: World):
         ),
         Ball(),
         #
-        physics.Velocity(Vec2(velocity)),
+        physics.Velocity(velocity),
         physics.CollisionHandler(__bounce_on_player),
     )