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Cool. I notice that something dropped from the top accelerates downwards. But something released at the bottom doesn't seem to accelerate noticeably upwards. Even with drag, a bouyant object should accelerate towards the suface, shouldn't it?

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Note drag increases with speed. So objects accelerate until drag negates buoyancy and then it just goes upwards at a costant speed.

I guess that the 'terminal velocity' is quite slow as the difference between water and ice buoyancy is small.

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