\[s(t) = 0,5t^{2} + 3t + 2;\ \ t = 4\ с.\]
\[1)\ s(4) = 0,5 \bullet 16 + 3 \bullet 4 + 2 =\]
\[= 8 + 12 + 2 = 22.\]
\[2)\ s^{'}(t) = 0,5 \bullet 2t + 3 =\]
\[= 4 + 3 = 7.\]
\[Ответ:\ \ 22\ м;\ 7\ м\text{/}с.\]