\[\boxed{\text{1076.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\textbf{а)}\ v_{0} = 600\ \frac{м}{с}:\]
\[s = \frac{600^{2}}{10} = \frac{360000}{10} =\]
\[= 36\ 000\ м = 36\ км.\]
\[\textbf{б)}\ s = 24\ км = 24\ 000\ м:\]
\[24\ 000 = \frac{v_{0}^{2}}{10}\]
\[v_{0}² = 240\ 000\ \]
\[v_{0} = \sqrt{240000} \approx 490\ \frac{м}{с}.\]