Once again, instructions are on the project - use the arrow keys. This project shows the cat decelerating after moving. If you make the acceleration a larger number, the deceleration becomes more obvious.
Uh...idk if I even did physics properly at all since I don't really know how friction works too well (once again, I did loads of unecessary research)...uhh, but it still works, kinda. I know it's not perfect, since sometimes you can barely even see the cat slow down, but hey, it still works for the most part. I made this project just in case I ever want to make some sort of platformer.