The force constants of two springs are ${K_1}$ and ${K_2}$. Both are stretched till their elastic energies are equal. If the stretching forces are ${F_1}$ and ${F_2}$, then ${F_1}:{F_2}$ is
  • A${K_1}:{K_2}$
  • B${K_2}:{K_1}$
  • C$\sqrt {{K_1}} :\sqrt {{K_2}} $
  • D$K_1^2:K_2^2$
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