\[\boxed{\mathbf{1547}\mathbf{.}}\]
\[h = v_{o}t - 4,9t^{2};\]
\[v_{0} = 360\ м\text{/}с:\]
\[h^{'}(t) = v_{0}(t)^{'} - 4,9\left( t^{2} \right)^{'} =\]
\[= v_{0} - 4,9 \bullet 2t = 360 - 9,8t.\]
\[t = 10\ с:\]
\[h^{'}(10) = 360 - 9,8 \bullet 10 =\]
\[= 360 - 98 = 262\ \left( м\text{/}с \right).\]
\[Скорость\ пули\ равна\ нулю:\]
\[360 - 9,8t = 0\]
\[9,8t = 360\]
\[t \approx 36,7\ (с).\]
\[Ответ:\ \ v = 262\ м\text{/}с;\ \ t \approx 37\ с.\]