I found the lighter one a lot easier to do as it's the sort of thing i've done before on flash.
Here is the heavier ball which I found harder to do. I'm not as pleased with it as I think I should have made it roll a bit longer. I think the rolling on both doesn't look natural but will be improved when we add shadow and texture to show rolling.
I found this quite fun to do but challenging coz i've never used Maya and usually work in 2D.