What is the magnitude of upthrust force on a metal ball immersed in water?

bejoulais
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a metal ball weighs 1 N in air and 0.8 N when totally immersed in water. find magnitue of upthrust force.
 
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How do you explain the fact that the ball weighs 0.2N less in the water than it does in air?
 
it's pretty clear 1-0.8=0.2N
 
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