calculate the work done in raising a stone of mass 10kg through a vertical height of 4m
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Apparent weight =mg−FB
where, FB is buoyant force and mg is weight
We know that buoyant force FB will be:
FB=Vρwaterg=ρstonemρwaterg
where V is volume of stone =ρstonem and ρwater is density of water
As specific gravity is given as 3 it's density will be three times of water
ρwaterρstone=3
Hence, FB=3mg
Putting the values of m,g and applying the formula for work done,
Work done = Apparent weight × displacement
=10×g×h−310×g×h
=32×10×10×6
=400 J
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