Generalized Velocities are the time derivatives of the generalized coordinates of the system.
Applicable units are those of quantitykind:GeneralizedVelocity
http://en.wikipedia.org/wiki/Generalized_coordinates
Generalized Velocities are the time derivatives of the generalized coordinates of the system.
$\dot{q_i} = \frac{dq_i}{dt}$, where $q_i$ is the generalized coordinate and $t$ is time.
http://www.iso.org/iso/catalogue_detail?csnumber=31889