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Elongation of a uniformly loaded prismatic bar is: 
AP/AE
BFL/E
CRandom
Dδ = PL/(AE) — direct application of σ = Eε
Answer & Solution
Correct answer: D. δ = PL/(AE) — direct application of σ = Eε
Derivation: σ = P/A, ε = σ/E = P/(AE), δ = εL = PL/(AE). Famous 'PL/AE' formula. For multi-segment bars, sum δ_i = ΣP_iL_i/(A_iE_i). For tapered bar, integrate.
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