Question

Lron nail will sink in water butship willfloat why does this happen

Answer 1

The density of nail (as of iron) is much larger than the water. So it sinks easily. The weight of the water displaced by the ship is equal to its weight, so it floats. Whereas the weight of the water displaced by the iron nail is less than its weight so the iron nail sinks.

Answer 2

Heya!
Not because the water drags the ship down, but because the ship is no longer displacing enough water. Essentially, that iron nail sinks because it's so dense, yet so compact, that it barely displaces any water, yet weighs a significant amount..
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