3

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

enter image description here

enter image description here

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

5

enter image description here

\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}

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