A body weights X in air and Y in water . What is the upthrust.
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Upthrust is the force exerted by a fluid on an object in upwards direction. That's why up-thrust acts against the weight of an object. We know that Upthrust (U) = weight of the liquid displaced by the submerged part of the body. So $U = mg$ , where m is mass of the body and g is the acceleration due to gravity.
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