  As one of the most influential experiments on the development of modern
macroscopic theory from Newtonian mechanics to Einstein's special theory of
relativity, the phenomenon of light dragging in a moving medium has been
discussed and observed extensively in different types of systems. To have a
significant dragging effect, the long duration of light travelling in the
medium is preferred. Here we demonstrate a light-dragging experiment in an
electromagnetically induced transparent cold atomic ensemble and enhance the
dragging effect by at least three orders of magnitude compared with the
previous experiments. With a large enhancement of the dragging effect, we
realize an atom-based velocimeter that has a sensitivity two orders of
magnitude higher than the velocity width of the atomic medium used. Such a
demonstration could pave the way for motional sensing using the collective
state of atoms in a room temperature vapour cell or solid state material.
