Two springs have spring constants ${K_A}$ and ${K_B}$ and ${K_A} > {K_B}$. The work required to stretch them by same extension will be
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(a)Work done in stretching $(W)$ $\propto$ Stiffness of spring (i.e. $k$)
${k_A} > {k_B}$
${k_A} > {k_B}$
==> ${W_A} > {W_B}$
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