Question

when an object is immersed in water it feels lighter weight loss is due o

Answer 1

Because the upthrust exerted on the object.

Answer 2

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An object in water looses "weight" because the water column beneath it pushes the object upwards. Now an object in water experiences a downward pull of gravity we call weight but the water follows newtons third law and exerts an upward force, which pushes the object upwards.