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\documentclass[a4paper]{article}% Dominique Rodriguez/hv 2005
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{pstricks,pstricks-add}
\pagestyle{empty}
\begin{document}
\newcommand{\InitCond}{ 0 0 5 10}
\newcommand{\OMEGA}{6.283185}
\newcommand{\h}{0.1}
\psset{unit=2}
\begin{pspicture}[showgrid=true](0,-2)(3,1.2)
\psset{method=rk4,algebraic=true,whichabs=0,whichord=1}
\psplotDiffEqn[linecolor=red,linewidth=1pt,plotpoints=500]
{0}{10}{\InitCond}{y[2]|y[3]|\OMEGA*y[3]-\h*(sqrt(y[2]^2+y[3]^2))*y[2]|-\OMEGA*y[2]-\h*(sqrt(y[2]^2+y[3]^2))*y[3]}
\psline{->}(0.5,1)
\uput[90](0.5,1){$\overrightarrow{v}_0$}
\pscircle{0.1}\psdot(0,0)
\uput{3mm}[180](0,0){$\overrightarrow{B}$}
\end{pspicture}
\end{document}
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