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A block of weight W produces an extensio...

A block of weight `W` produces an extension of `9cm` when it is hung by an elastic spring of length of `60cm` and is in equilibrium. The spring is cut into two parts, one of length `40cm` and the other of length `20cm`. The same load `W` hangs in equilibrium supported by both parts as shwon in figure. The extension in `cm` noe is

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