Colonel John P. Stapp, USAF, participated in studying whether a jet pilot could survive emergency ejection. On March 19, 1954, he rode a rocket-propelled sled that moved down a track at a speed of 632 mi/h. He and the sled were safely brought to rest in 1.40 s.

a) Determine the negative acceleration he experienced.

_ _ _ m/s
2

b) Determine the distance he traveled during this negative acceleration.

_ _ _ m

a) Deceleration = 201.76 m/s^2

b) Distance traveled = 197.68 m

Explanation:

Initial Speed = 632 mi/h

Initial Speed (in meters/second) = (632 * 1.609 * 1000) / (60 * 60) = 282.4 m/s

Time to decelerate = 1.4 seconds

a)  Change in speed = Acceleration * time

-282.4 = Acceleration * 1.4

Acceleration = -201.76 m/s^2

Deceleration = 201.76 m/s^2

b)  Distance traveled = average speed * time

average speed = 282.4 / 2 = 141.2 m/s

Distance traveled = 141.2 * 1.4

Distance traveled = 197.68 m

pe = weightxheight = 2000x1000=2,000,000joules

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