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Acceleration can reach 1,200 g during 60-mph collisions. Oldegard and Wernan measured a force of 290 g atthe left shoulder in 38-mph collisions. This more moderate collision produces a force of 198,000 N in anormal-sized adult. Although some of the force is absorbed by the compliance in the chest wall and compressionof the aorta containing a fluid under pressure, this force exceeds by almost 10 times the force requiredto split an aorta in our experiment.