I have been searching for formulas to do with car crashes. I have found formulas on the force that a car crash exerts on the body of a person driving the car but I cannot find any to do with a collision or crash between a car and a human / animal. I need an equation so I can compare the difference between the force exerted and possible damage to a person being hit by a bull bar as apposed to a car with no bull bar and crumple zones. Any information will be a big help! I think I might be able to use a Elastic collision equation but i'm not sure. In the meantime i'll keep searching.