by melvin88 on Tue Nov 03, 2009 6:00 pm
wow..cool down 3zz, is good if u angry use ur horn, but not ur mouth =D sometime driver did mistake,just horn them, they will learn they mistake
Speed is the rate of motion, or equivalently the rate of change of distance.
Speed is a scalar quantity with dimensions length/time; the equivalent vector quantity to speed is velocity. Speed is measured in the same physical units of measurement as velocity, but does not contain the element of direction that velocity has. Speed is thus the magnitude component of velocity. Therefore, speed is always positive.