Answer
Please see the work below.
Work Step by Step
We can find the fraction as follows:
$\frac{t_1}{t_2}=\frac{2\sqrt{\frac{2(\frac{h}{2})}{g}}}{2\sqrt{\frac{2h}{g}}}$
$\frac{t_1}{t_2}=\sqrt{\frac{1}{2}}$
$\frac{t_1}{t_2}=0.71$
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