A) 20 mm
B) 10 mm
C) 5 mm
D) 2.5 mm
Correct Answer: D
Solution :
\[{{k}_{1}}=\frac{1000}{10}=100\,\,\text{N/mm}\] \[\text{k}\propto \frac{1}{n}\] \[{{k}_{2}}=100\times 2=200\,\text{N/mm}\] \[{{k}_{e}}=2\times 200=400\,\text{N/mm}\] \[\delta =\frac{1000}{400}=2.5\,\,mm\]
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