The famous painting of the old-time child's game 'snap the whip' is a fantastic illustration of the transference of energy. I would guesstimate that the children in the painting have transferred perhaps the equivalent of 2+/- mph of energy through the whip and that explodes the end children off the whip. Note that the "base" of the whip requires two boys to stabilize the transference. Imagine then the amount of energy that transfers in a 7 mph crash straight into the body of the occupants of a vehicle and you will understand why a 7 mph crash is considered a high speed crash.
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