What makes a plastic mug full of water appear lighter inside water?

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Solution

Explanation:
When an object is filled with water or any other liquid, it is subjected to a force that aids in its floating. The upward push of the buoyant force is applied to the immersed item.
The upward thrust is caused by the buoyant force.
According to Archimedes' principle, this buoyant force is equal to the weight of the fluid that the body displaces.
As a result, the mug's net force will be, $F_{n e t} = F_{w e i g h t} - F_{u p t h r u s t}$
As a result, when a plastic mug is filled with water, it seems lighter.

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