# How two draw a two-head vector and curly brace in picture environment?

I want to insert a two-head vector, and a curly brace of length of my choice, as shown in figure below

in the picture environment and want to put it on the specified location. Unable to find any reasonable hint for this.

\documentclass{article}

\begin{document}

\begin{picture}(100,100)

\put(20,20){\vector(-1,0){0}}
\put(20,20){\vector(1,0){50}}
\put(30,60){\makebox(200,5){\upbracefill}}

\end{picture}
\end{document}