Question

a piece of wood if left under water comes to the surface explain the reason

Answer 1

Density of wood is less than the density of water. That is why it floats on the surface of water and if immersed, the upthrust acting on the wooden piece will be greater than its weight pulling it downwards, so it comes to the surface.

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Answer 2

It's because the density of water is greater than the density of the piece of wood.
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