A) 6.25 Nm
B) 12.5 Nm
C) 18.75 Nm
D) 25.00 Nm
Correct Answer: C
Solution :
Work, \[W=\frac{1}{2}k(x_{2}^{2}-x_{1}^{3})\] \[=\frac{1}{2}\times 5\times {{10}^{3}}\left[ {{\left( \frac{10}{100} \right)}^{2}}-{{\left( \frac{5}{100} \right)}^{2}} \right]\] \[=\frac{1}{2}\times \frac{5\times {{10}^{3}}}{{{10}^{4}}}(100-25)\] \[=\frac{75}{4}\]
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