I don't think this is possible (maybe possible, but definitely not practical) to animation the motion in KS. If it were me, I would create the motion of the ball in a 3D suite such as Blender3D (free and open-source) and then bring that motion into Keyshot using an Alembic file (.abc).
There are some tutorials existing online for how to animate something like this in Blender if you google it, you could also use other 3D software such as 3DSMax, Cinema4D, Maya, etc. but those are not free programs.