\ANG{
\parbox[t]{0.45\textwidth}{
Welche Beschleunigung erf"ahrt der Block der Masse $4{,}0\,\mathrm{kg}$?
Die Reibungskr"afte sind zu vernachl"assigen.
}\hspace{0.1\textwidth}
\parbox[t]{0.45\textwidth}{
\begin{center}
	\psset{unit=1cm}
	\begin{pspicture}(-5,-4)(2,2)
        \psline[doubleline=true,doublesep=5pt,doublecolor=lightgray](-0.4,-0.4)(0.6,0.6)
		\psframe[fillstyle=solid, fillcolor=lightgray,linestyle=none](-5,0)(0,-3.75)
        \pscircle[fillcolor=lightgray, fillstyle=solid](0.6,0.6){0.4}
        \pscircle[fillcolor=white, fillstyle=solid,linestyle=none](0.6,0.6){0.15}
        \pscircle[fillcolor=black, fillstyle=solid](0.6,0.6){0.1}
        \psline(-5,0)(0,0)(0,-3.75)
        \psline(-2,1)(0.6,1)
        \psframe[fillcolor=gray,fillstyle=solid](-4,0)(-2,2)
        \psline(1,0.6)(1,-1)
        \psframe[fillcolor=gray,fillstyle=solid](0.25,-1)(1.75,-3)
        \rput(-3,1){$4{,}0\,\mathrm{kg}$}
        \rput(1,-2){$3{,}0\,\mathrm{kg}$}
	\end{pspicture}
\end{center}
}}
\LSG{
$\frac{3}{7}\,g$
}
