Mass of the ball = 61.22g from Archimedes' principle
Define Archimedes' principle .
Archimedes' principle states that the upward buoyant force this is exerted on a frame immersed in a fluid, whether or not completely or partially, is same to the weight of the fluid that the frame displaces. Archimedes' precept is a regulation of physics essential to fluid mechanics. It became formulated by Archimedes of Syracuse
Buoyant force = Fb = 3.81-3.21 = 0.60N
mass of liquid displaced = 0.60/9.8 = 0.0612 kg = 61.22g
Mass of the ball = 61.22g from Archimedes' principle
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