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Doubling the sink rate at touchdown changes the energy the undercarriage must absorb by a factor of

  • A.4
  • B.2
  • C.8
  • D.1.4

Answer: A

Kinetic energy goes as the square of velocity, so twice the sink rate means four times the energy. This is why design sink rates are specified so carefully and why a heavy landing is treated as an inspection-triggering event.

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