Two pieces of cork, one small and another big are pushed below the surface of water. Which has greater tendency to rise swifty?

Explanation

The upthrust on a piece of cork is equal to the weight of water displaced by a cork. As bigger piece of cork will displace more weight of water than small piece of cork, hence upthrust is greater on the bigger piece of cork. As a result of it, the bigger piece of cork has greater tendency to rise swiftly.