A ship rises when it enters from sea to river because:

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the force of buoyancy decreases

the force of buoyancy increases

the volume of ships increases

the mass of the ship increases

answer is A.

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Detailed Solution

A ship rises when it enters from sea to river because the force of buoyancy decreases.
When a ship enters from the river to sea, it gets raised a little due to greater buoyant force. Seawater is denser than river water. The ship displaces equal volumes of water in sea and river, the density of seawater is greater than the density of river water, and buoyant force by seawater is greater than buoyant force by river water.

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