👉 Correct Answer:
A pile of loosely packed down feathers would need to be approximately 75 meters (246 feet) tall to give you a good chance of surviving a fall from 35,000 feet, assuming a gradual deceleration to keep forces below 20 g. This assumes ideal feather arrangement and no other factors like wind or body orientation affecting the fall. For reference, this is roughly the height of a 20-story building.
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