Here are my submissions to exercises 1 and 2. I had a lot of fun doing this little animations and they definitely helped me overcome my fear of animating and even though there're a lot of things I still have to learn, I know it's just a matter of practice and study that I be able to start applying those too. For now, this is a victory for me!
PS: Instead of Photoshop, I used ClipStudio Paint.
I feel that in this one the ball stays for a bit too long in the higher keyframe, but maybe it's just my perception.