Goign through walls

1

I have this game where you are sent flying p[retty fast and your supposed to like stop dead when you hit a wall. but it seems if the force is fast enough it will fly through the wall.

2

Try this:

oldX = this._x;//In the beginning

//then after you move it and all
if((oldX < _root.thisIsWhereYouPutTheWall._x) && (this._x > _root.sameWall._x)){
this._x = _root.sameWall._x;
_root.yourSpeedVariable = 0;
}

something like that