A) \[0.49\times {{10}^{4}}\,N/m\]
B) \[1.96\times {{10}^{4}}\,N/m\]
C) \[4.9\times {{10}^{4}}\,N/m\]
D) \[0.196\times {{10}^{4}}\,N/m\]
Correct Answer: B
Solution :
\[F=Kx\Rightarrow K=\frac{F}{x}=\frac{9\times 9.8}{4.5\times {{10}^{-3}}}=1.96\times {{10}^{4}}N/m\]
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