Question

why does a big ship made up of iron float on water but a coin sinks​

Answer 1

Explanation:

The density of iron is more than the density of water, so the weight of iron is more than weight of water displaced by it and nail sinks. While the shape of an iron ship is made in such a way that it displaces more weight of water than its own weight.

Answer 2

Because the density of the ship coin doesn't have a hollow core so the coin sinks