{TAIL ~ The ratio} of {HEAD ~ the outbound velocity} to the inbound velocity is commonly referred to as the coefficient of restitution  
{ TAIL ~ The ratio } of { HEAD ~ the outbound velocity } to the inbound velocity is commonly referred to as the coefficient of restitution
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH