Answer
$k_1=2k_0$
Work Step by Step
We use the equation for the spring constant of springs in a series configuration to find:
$\frac{1}{k_0}=\frac{1}{k_1}+\frac{1}{k_1}$
$\frac{1}{k_0}=\frac{2}{k_1}$
$k_1=2k_0$
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