Question

A mug full of water appear light as long as it is under water in the bucket than when it is outside water.why

Answer 1

"A mug full of water feel lighter inside water because the buoyant force is acted upwards by the water on mug full of water which leads to the apparent loss in weight.".

Answer 2

it's because of the buoyant force acting on the mug . So the apperant weight is less than the weight of the mug.