A) 30
B) 40
C) 10
D) 20
Correct Answer: A
Solution :
\[\frac{1}{2}k{{S}^{2}}=10\,J\](given in the problem) \[\frac{1}{2}k[{{(2S)}^{2}}-({{S}^{2}})]=3\times \frac{1}{2}k{{S}^{2}}=3\times 10=30\,J\]You need to login to perform this action.
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