upthrust = weight of the volume of water displaced by stone
= m\times g
= mass of displaced water \times g
the volume of stone equal to the volume of water displaced. thus the volume of displaced water is 200
then the mass of displaced water is = density of liquid x volume
m = 1.20\times 200 = 240 g
upthrust = 240/ 1000\times 10
= 2.4 N
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