> RELATIVE speed kills absolutely. E. g. if a bullet has a relative speed of
> about 500 mph to its target. If one can ride as fast as the bullet and to
> the same direction - no harm.
>
> Regards,
> Imre

I find news reports annoying when they are describing a traffic accident
and say the cars collided head-on at, for example, "a combined speed
of 150mph"

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. Anything caught in the car sandwich would experience 75mph
forces on either side though

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