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The maximum speed in horizontal flight occurs when…

  • A
    The thrust is equal to minimum drag.
  • B
    The thrust is equal to the maximum drag.
  • C
    The thrust does not increase further with increasing speed.
  • D
    The maximum thrust is equal to the total drag.
Refer to figure.
Maximum speed occurs when thrust is equal to drag. It is not possible to accelerate to a higher airspeed in straight and level flight since drag would exceed thrust.

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