collision with upper edge only

hi
i have two object one “ball” and “many brick are coming randomly” in my game. both are physics body and collision happening good, as well as ball is getting some velocity. due to that region “ball is collide also bottom edge from other brick” but i want, when ball collide with “bottom edge from other brick” in that time interval only ball should behave not like physics body…
any help please
[import]uid: 87661 topic_id: 26333 reply_id: 326333[/import]