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What is the approximate error in computed elongation?

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asked in som by (215k points)
A bar of length L tapers uniformly from diameter 1.1 D at one end to 0.9 D at the other end. The elongation due to axial pull is computed using mean diameter D. What is the approximate error in computed elongation?                      

(a) 10%                 (b) 5%     (c) 1%        (d)0.5%

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