Use continuous collision

godot/scenes/Ball.tscn

@@ -17,6 +17,7 @@ collision_mask = 14
 mode = 2
 physics_material_override = SubResource( 1 )
 gravity_scale = 0.0
+continuous_cd = 2
 contacts_reported = 1
 linear_velocity = Vector2( 100, 100 )
 linear_damp = 0.0