Swinging a bat to hit a falling ball

Hey there!

I am pretty new to Unity and therefore after walking through several tutorials, I am having abit of difficulties with my game building. I have made in photoshop each step of the swinging motion , and put it as Game Objects in the game , but I just can't find the right way to manage them properly so that they would collide with the ball (falling from above) . I have tried Animation as well , but sadly it only keep the first Polygon2d Collider that I create and it doesn't continue on with it.

Please maybe someone will be of rescue ? I would be most appreciate for any suggestions. Thank you and have a good day.