A) 30
B) 40
C) 10
D) 20
Correct Answer: A
Solution :
As given in the problem,\[\frac{1}{2}k{{s}^{2}}=10\,J\] \[\therefore \]\[\frac{1}{2}k\left[ {{(25)}^{2}}-{{(s)}^{2}} \right]=3\times \frac{1}{2}k{{s}^{2}}=3\times 10=30\,J.\] Hence, the correction option is [a].You need to login to perform this action.
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