Foot per Second (ft/s or ft/sec or fps) : A traditional unit of velocity. One foot per second equals exactly 15/22 mile per hour or exactly 1.097 28 kilometers per hour
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}