[codectile]

Let me explain you all the basic working principle of bullet physics, especially the activation and the deactivation part. If you throw an object with a certain velocity it will move few units and will stop after some time. When the object is at rest it is deactivated by the engine to reduce the cpu usage by reducing the number of collision checks on each object. Now the question arises, "Will the deactivated object still interact?", the answer is yes. If you throw another object on the deactivated object, physics will trigger again on the two objects. As soon as the AABBs of the two objects overlap the deactivated object gets activated again as it gets added in the collision check list within the engine.