Motion In A Plane

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 $\_\_\_\_$ $\mathrm{m} / \mathrm{s}$.

\(\text { (take } \mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2 \text { ) }\)