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Question

# A uniform chain of length 2 m is kept on a table such that a length of 60 cm hanging freely from the edge of the table. The total mass of the chain is 4 kg. The work done is pulling the entire chain on the table (Take g=ms−2).

A
12.9 J
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B
6.3 J
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C
3.6 J
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D
2.0 J
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Solution

## The correct option is D 3.6 JMass of length 2 m of the chain =4 kgMass of length 60 cm or 0.60 m of the chain=4×0.602=1.2 kg.Weight of the hanging part of the chain=1.2×10=12 NSince the centre of gravity of the hanging part lies at its mid point, i.e. 30 cm or 0.30 m∴W=12×0.30=3.6 J.

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