A) 8 J
B) 23 J
C) 68 J
D) 84 J
Correct Answer: A
Solution :
From the relation \[F=kx\] or \[k=\frac{F}{x}=\frac{10}{1\times {{10}^{-3}}}={{10}^{4}}N\text{/}m\] and also \[F=kx={{10}^{4}}\times 40\times {{10}^{-3}}=400\,N\] Now work done, \[W=\frac{1}{2}Fx=\frac{1}{2}\times 400\times 40\times {{10}^{-3}}=8\,J\]You need to login to perform this action.
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