Q.

A ladder AB of length 4m long and of weight 200N with its centre of mass at a distance 2m from end A is on the ground. A 60N weight is attached to the end B. The work to be done to arrange the ladder in vertical position with end A contact with the ground is (g=10ms−2)

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a

600J

b

250J

c

475J

d

640J

answer is D.

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Detailed Solution

w=200×2+60×4=400+240=640J
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A ladder AB of length 4m long and of weight 200N with its centre of mass at a distance 2m from end A is on the ground. A 60N weight is attached to the end B. The work to be done to arrange the ladder in vertical position with end A contact with the ground is (g=10ms−2)