A gun mounted on the ground fires bullets in all directions with same speed. The farthest distance the bullets could reach is 6.4 m . The speed of the bullets from the gun is $\_\_\_\_$ $\mathrm{m} / \mathrm{s}$.
(take $\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2$ )
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