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Originally Posted by 4Vman
Correct, equal and opposing forces will cancel each other out, the variables are weight, angle of collision and speed of the 2 objects, 2 cars of equal weight (inertia) hitting squarely head at 100kpm each will have the effect of hitting a padded (compensate for crumple of second vehicle) brick wall at 200kph...
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Except force (inertia) isn't linear. If you go twice the speed (hit the wall at 200km/h), you would need more than twice the crumple zone.
Similar concept to brake performance. Double the speed, you triple the required braking distance.