> > Like your bullet, it makes no difference if you're doing 75mph and
> > hit a wall head-on or a car head-on. You still deccelerate from 75 to
> > 0 in a big hurry.
>
> Actually if you hit the wall head-on you hit it with 75mph, but if you hit
> a car head-on which is also doing 75mph in your direction it is the
> same thing as hitting a wall at 150mph, or your car doing 150mph and
> hitting a car head-on which is not moving

OK, I thought about it this way, maybe you're right. If you were in a
stationary vehicle (or even a stationery vehicle if you were delivering
office supplies) and a car hit you at 75mph, that would sting. So if you
were travelling at 75mph also and hit head-on.......

What I'd reasoned was that at the point of impact you as a vehicle have
deccelerated from 75 to 0 and stopped at exacty the same point you
would have if you'd hit a stationary wall. Hmmm, still not convinced
about that "combined speed" thing

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