hey what happens if you pull on something that's halfway in/ halfway out of a speed bubble? Say, pushing a long table - how fast does it move?
Somebody correct me if I'm wrong, but my understanding is that if something like a table extended beyond the edge of a speed bubble it would make the bubble visible. I don't think the bubble can be extended through solid matter. That does bring to mind an interesting thought. The space under the table could possibly be a window into the bubble and reveal what was happening inside at hyper speed. Either way, that would make the pushing/pulling on an object that crossed the edge a moot point since the element of surprise would be gone. The second you pushed/pulled on it, those outside the bubble would see it and react accordingly.
If my above assumptions are correct than the speed bubble wouldn't have any affect on the momentum of the object being pushed/pulled. The object would respond normally to the amount of force applied to it.