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Answer on Mechanics | Relativity Question for Porter Black

Question #61712
In World War II, there were several reported cases of
airmen who jumped from their flaming airplanes with no
parachute to escape certain death. Some fell about 20,000
feet (6000 m), and some of them survived, with few lifethreatening
injuries. For these lucky pilots, the tree branches
and snow drifts on the ground allowed their deceleration to be
relatively small. If we assume that a pilot’s speed upon impact
was 123 mph (54 m/s), then what was his deceleration?
Assume that the trees and snow stopped him over a distance
of 3.0 m.
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