$$2 \times (22/7) \times \sqrt{ l/9.8 } =1$$
$l=\frac{2401}{9680}\approx 0.24803719$
$$\frac{\frac{44}{7}\sqrt{\frac{5}{49}l}}{\frac{44}{7}}=\frac{1}{\frac{44}{7}}$$
$$\sqrt{\frac{5}{49}l}=\frac{1}{\frac{44}{7}}$$
$$\sqrt{\frac{5}{49}l}=\frac{7}{44}$$
$$\frac{5}{49}l=\frac{49}{1936}$$
$$\frac{\frac{5}{49}l}{\frac{5}{49}}=\frac{\frac{49}{1936}}{\frac{5}{49}}$$
$$l=\frac{\frac{49}{1936}}{\frac{5}{49}}$$
$$l=\frac{2401}{9680}$$
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