Vertikalni hitac - 4.

$\vec{a}=0\backslash vec\{a\}=0$

$\vec{a}=\vec{g}\backslash vec\{a\}=\backslash vec\{g\}$

$\vec{a}=-\bar{g}\backslash vec\{a\}=-\backslash bar\{g\}$