The balls look great, there are only minor changes.
First, the colorful beach ball needs two fixes. One, right before it hits the ground it gets really fast, so add one or two frames before the impact. And two, let the ball roll for a few frames at the very end so it doesn't just stop. It's subtle, but still.
Same goes for the basket ball, it needs to continue rolling as well for a few frames.
Th heavy one is good, but I would lower the ball at x19. It feels heavy at the beginning but then you have it bounce 3 times and the last one just goes up to high, not a lot, just lower it a tiny bit.
Other than that you're done. I'd move on to another assignment while you fix this one.
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28 minutes ago