documentclass{article}
usepackage{longtable,booktabs}
usepackage{graphicx,grffile}

setlengthtextfloatsep{5em}

title{test}
begin{document}
This is a test table.

begin{longtable}[]{@{}cl@{}}
caption{test table}tabularnewline
toprule
col1 & col2tabularnewline
midrule
endhead
1 & 2tabularnewline
bottomrule
end{longtable}

This is test figure.

begin{figure}[h]
centering
includegraphics[width=0.5textwidth]{test.png}
caption{test figure}
end{figure}

End of the document.
end{document}