A) 30
B) 40
C) 10
D) 20
Correct Answer: A
Solution :
\[\frac{1}{2}k{{S}^{2}}=10\ J\] (given in the problem) \[\frac{1}{2}k\left[ {{(2S)}^{2}}-{{(S)}^{2}} \right]=3\times \frac{1}{2}k{{S}^{2}}\]= 3 × 10 = 30 J
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