A) 30
B) 40
C) 10
D) 20
Correct Answer: A
Solution :
\[u=\frac{1}{2}K{{s}^{2}}\] \[\Rightarrow \] \[10=\frac{1}{2}K{{s}^{2}}\] ? (i) Work done,\[W=\frac{1}{2}K{{(2s)}^{2}}-\frac{1}{2}K{{s}^{2}}\] \[=2K{{s}^{2}}-\frac{1}{2}K{{s}^{2}}\] \[=\frac{3}{2}K{{s}^{2}}\] From equation (i), we get \[W=3\times 10=\mathbf{30}\]joules.You need to login to perform this action.
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