Simple physics

Hey, I’ve been researching alot about various physics engines for flash and there seem to be alot of good ones out there. Although they seem quite complicated for the very simple thing I am trying to create, which is an object that falls down but is constrained to a string so it bounces a bit and then stops. Would it be possible for somebody to make an example so i can dissect it and maybe get a thing or two out of it?
I attach an image so you can see what i mean.