Daniel Brodesky talks about the process of overshooting – moving an object from point A to point B, but going just past point B and bouncing back. It’s a physics thing.
If you’re doing a lot of this type of thing, I highly recommend Newton for After Effects, The Ultimate Physics Engine Plug-in for After Effects. Newton interprets 2D composition layers as rigid bodies interacting in a real environment. Newton provides many simulation controllers such as body properties (type, density, friction, bounciness, velocity, etc), global properties (gravity, solver), and allows the creation of joints between bodies. Once simulation is completed, animation is recreated in After Effects with standard keyframes.