How can I tell if my Cat suffered after being hit by a car?

My cat was hit by a car and the neighbour found him in his yard the next day. He some how travelled a distance of 20 feet before finally collapsing in his final resting place. Is there anyway of telling if he suffered, of does the body naturally kick in some kind of painkiller?
Sorry I should clarify that his was found no longer alive.
 
Shock sometimes masks pain. You could take it to a vet for a necropsy and they can tell you exactly how it died.
 
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