Question

A small metal coin sinks in the water ,then how do a huge ship made of metal floats on the water ​

Answer 1

If the boat weighs less than the maximum volume of water it could ever push aside (displace), it floats. But it sinks into the water until its weight and the upthrust exactly balance. The more load you add to a boat, the more it weighs, and the further it will have to sink for the upthrust to balance its weight.