Whip/Pendulum Physics?

I've been playing around with an idea, and I can't seem to figure out one part of it.

Imagine kind of a sling shot where you pull back from an origin point and let it go. Except when you let it go it doesn't launch anything it just pushes past the origin point a little then back to the point of origin. Think sort of like a pendulum at rest.

I've been trying to figure this out, but I can't seem to get it to work for the life of me. Any help would be appreciated.

Bump? Still looking if anyone can think of something that could help out.

Could a damped spring be helpful?

https://dl.dropboxusercontent.com/u/5426011/examples18/dampped_spring.capx

I may play with that idea as well, but I found a work around for it.

Now I'm having issues with scrolling to a physics item that's apparently going to fast.

Yea, the camera doesn't center on my camera object, not sure how to fix that, but I'm sure I'll figure it out...