GPT-4 answer: The weight of an object is determined by its mass, regardless of whether it floats or sinks. So, when you ask which is heavier, a small passenger

GPT-4 answer: The weight of an object is determined by its mass, regardless of whether it floats or sinks. So, when you ask which is heavier, a small passenger ferry or a two metric ton heavy rock, it all comes down to the actual mass of the ferry. A two metric ton rock weighs two metric tons by definition (or 2000 kilograms). However, a small passenger ferry, while it may look small compared to large ferries or ships, can weigh much more than two metric tons. Even a small passenger ferry can weigh dozens or even hundreds of tons, due to the mass of the hull, the engine, and other equipment on board. So, without specific information about the ferry's mass, it's safe to assume that a "small" passenger ferry is likely heavier than a two metric ton rock. However, if the ferry is particularly small and lightweight, or the term "ferry" is being used to describe a very small watercraft (like a raft or dinghy), it's possible for it to be lighter. You would need the specific weight of the ferry to give a definitive answer.