# 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.

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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