The fixed distance divided by {TAIL ~ the transit time} is equivalent to the average velocity of the ball over {HEAD ~ the fixed distance} 
The fixed distance divided by { TAIL ~ the transit time } is equivalent to the average velocity of the ball over { HEAD ~ the fixed distance }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD