Camera...inertia?

Hi, I’m working on a camera that zooms in and out with the mouse-wheel.

I’ve got it to zoom in and out fine (it’s not very smooth though). But I’m wondering if there’s a way to give the camera itself some type of inertia?

Like for instance, after I zoom in or out the camera just doesn’t come to a complete and immediate stop but instead slows down over time (a very short time).

Any ideas or examples on this one?

Thanks everyone.

Probably, you need interpretation?

Look: