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Q.

A ladder 'AB' of weight 300N 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 80N 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,

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a

500J

b

1000J

c

1150J

d

1900J

answer is B.

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Detailed Solution

W = mgh + Mghcm = (80 x 5 + 300 x 2) JW = 400 + 600 = 1000 J
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