The units do work out, as to the validity of the equation: no idea, but I've got my doubts. power = work/time = mass*length*length/time/time/time Left side: work = force*distance ; force = mass*acceleration; accel = s/t^2 or s/t/t therefore work = {[m*(s/t^2)]*distance} Power = {[m*(s/t^2)}*distance}/t = where m = mass s is a unit of length t is a unit of time Joe Yakubik