Naturally, one would think, the faster your going the more energy you will create and the harder you will hit. But take a deeper look. Under the basis that in a car accident, it isn't the "Crash" that kills you, but the stop (inertia). If you were to be involved in a head on collision with an equally similar car, would it be best to slow down and brake, or accelerate into the car. This plays off the concept of two cars traveling 50 mph would have a combined force of 100 mph. This was dis-proven on mythbusters. So the question now is, if you were to travel faster than the opposing car would the inertia spread out over a longer time provide any additional protection. Would there even be a difference in inertia? To start off, If Newton's 3rd law states each reaction has an equal and opposite reaction, and a 50 mph car hits another 50 mph car of identical weight and symmetry, they will both decelerate equally from a 50 mph collision. What if one car was going 60 mph and the other was doing 40? which driver is going to experience the larger force of deceleration? The driver going 60 isn't going to meet an identical force of 60 mph deceleration because the object this car is hitting is not carrying identical momentum. SO my question remains. To be clear i am not interested in the energy and damage to the vessel, however i am interested in the effects is has on the person inside. To eliminate a variable, lets assume the vessel does not get damaged at all.