A wire ‘AB’ is suspended about the end A. Marks C and D on it are 40 cm apart. When a load is suspended from B, then the marks C and D are displaced by 0.3 mm and 0.5 mm respectively. The original length of AD is
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A wire ‘AB’ is suspended about the end A. Marks C and D on it are 40 cm apart. When a load is suspended from B, then the marks C and D are displaced by 0.3 mm and 0.5 mm respectively. The original length of AD is