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Q.

The work done in lifting a stone of mass 10 kg and specific gravity 3 from the bed of a lake to a height of 6 m inside the water is (Take acceleration due to gravity as 10 m/s2, and neglect the effect of viscous forces)

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An Intiative by Sri Chaitanya

a

600 J

b

200 J

c

800 J

d

400 J

answer is C.

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Detailed Solution

work done = apparent weight x displacement

=mg1-dldsh=10×101-13×6=400J

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