Thank you for the opportunity to help you with your question!
Because when a body is immersed in water, it experiences an upward thrust (Archimedes? Principle) and loses weight equal to the weight of the water displaced by its immersed potion, and hence, is easier to lift objects.
Please let me know if you need any clarification. I'm always happy to answer your questions.
Nov 20th, 2015
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