Legend of Zelda: The wind Waker

[Extreme Angle]

Ok i am stuck on this game.
iI thought i would go back to my Gamecube and play on some games that i aint completed yet.
The part i am stuck on is a mini game or sumin...
It's like an island where you chuck these big things and try to get them in this hole with a flag init...
There's masive vines in the way so you must throw from behind the vines...
i did the first one but the second one is hard...
Anybody know what i'm talking about?