\documentclass{article}
\usepackage{array}
\begin{document}
\begin{tabular}{l>{\centering}p{2cm}}
xxx& abcabc\\abc \tabularnewline
xxx& \arraybackslash abcabc\\abc
\tabularnewline
xxx& \arraybackslash abcabc\newline abc \\
\end{tabular}
\end{document}