Two springs with spring constants ${K_1} = 1500\,N/m$ and ${K_2} = 3000\,N/m$ are stretched by the same force. The ratio of potential energy stored in spring will be
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(a) $U = \frac{{{F^2}}}{{2K}}$
$\Rightarrow U \propto \frac{1}{K}$
$\Rightarrow \frac{{{U_1}}}{{{U_2}}} = \frac{{{K_2}}}{{{K_1}}} = 2$
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