Abstract: A method and apparatus for measuring acceleration of a moving object. A body capable of transmitting pulses of energy is applied to the moving object, so as to be carried thereby and to move therewith. A pulse of the energy is transmitted in a forward direction from a first location on the body to a second location on the body at a known distance between the first and the second locations. The transmitted pulse is detected at the second location and the transit time of the pulse from the first location to the second location is measured. The measured transit time, together with the known distance between the first and the second locations, is utilized to determine the acceleration of the body and thereby of the moving object.