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Q.

A uniform chain of length 4m and mass 4 kg is placed on a smooth table with one-fourth of its length hanging over the edge. The work that has to be done to pull the whole chain back onto the table is

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a

5 J

b

2.5 J

c

7.5 J

d

10 J

answer is A.

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Detailed Solution

m = Mass of the hanging part=4×14kg=1 kgDisplacement of c.g. h = 0.5 mwork done =mgh=1×10×0.5 J=5 J
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