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3. The Air Force has conducted many studies on the effects of large accelerations on the human body. In one such study, Lt. Col. John L. Stapp rode a rocket sled that started from rest and attained a speed of 280 m/s in 5 s. The sled was then brought to rest in 1.5 s. What acceleration did Lt. Col. Stapp experience in the first 5 s? How far did the sled travel during this time? What acceleration was experienced in the last 1.5 s? How far did the sled travel in that time?
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