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It is interesting, but pretty vague as stated. What are they trying
to say exactly? In a "zeroth" approximation, other things equal, a
car hitting a rigid barrier at 40 mph is equivalent to 2 cars, each
travelling 40 mph, colliding head on. Equivalent here meaning damage
to each car due to dissipation of its KE. It is true that the cars
are "closing" at 80 mph, but "80" doesn't enter into any calculation
of KE, to my knowledge.