Q.

A ladder ‘AB’ of weight 300 N and length 5m is lying on a horizontal surface. Its centre of gravity is at a distance of ‘2m’ from end A. A weight of 80 N is attached at end B. The work done in raising the ladder to the vertical position with end ‘A’ in contact with the ground is (in J).

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answer is 1000.

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Detailed Solution

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P.E of the system is described by its amount of work done 
w=w1+w2w=m1gd1+m2gd2w=300×2+80×5w=600+400=1000J

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