Seriously, that page has to be one of the craziest things I've seen in One Piece so far, to the point where I kinda don't even like it.
I mean, seriously, where was it, and how do they sail around with it? It would be like a constant anchor, since you couldn't fit it on the ship since it's bigger than their entire ship, and it must weigh a 10,000 tons if it's not hollow.
Now for the physics… There's no way that Garp could throw that thing up over the ship, since he would need to push against the ship (with his feet) at a force greater than the weight of the ball before it would lift, but that would be sure to sink the ship he's standing on! And if he wanted to throw it that high, he would need to push with several times more weight!
And think about how he could hold onto a chain and throw it, too. Good thing Oda didn't try to draw that part! My only explanation would be that he jumped into the air with the chain, tugged on the chain with enough strength to pull the ball into the sky, which would also shoot him down towards the ball so that they met half-way, and then use the point of impact to redirect the ball and himself, and then land back on the deck and guide the ball down while holding onto the chain. ... Yeah... I know, it's crazy either way.
What do you think about that ridiculous attack? Is there any good explanation?