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A wire 'AB' is suspended about the end A...

A wire 'AB' is suspended about the end A. Marks C and D on it are 40cm apart. When a load is suspended from B, then the marks C and D are displaced by 0.3mm and 0.5mm respectively. The original length of AD is
1) 60 cm
2) 100 cm
3) 80 cm
4) `200/3` cm

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