42. An aircraft leaving ground effect during takeoff will
B) experience an increase in induced drag and a decrease in performance.
Flying close to a surface increases air pressure on the lower wing surface. This is called ground effect, and thereby improves the aircraft lift-to-drag ratio. The nearer the wing is with regards to the ground, the more pronounced the ground effect becomes. While in the ground effect, the wing requires a lower angle of attack to produce the same amount of lift. If the angle of attack and velocity remain constant, an increase in the lift coefficient occurs, which accounts for the "floating" effect.

Induced drag is reduced because wingtip vortices, which cause drag, can't fully develop close to the ground.  Due to the reduced drag in ground effect, the airplane may seem able to take off below the recommended airspeed.  However, as the airplane rises out of ground effect with an insufficient airspeed, initial climb performance may prove to be marginal because of the increased drag. Under extreme conditions such as high density altitude, high temperature, and maximum gross weight, the airplane may be able to become airborne at an insufficient airspeed, but unable to fly out of ground effect. Consequently, the airplane may not be able to clear an obstruction, or may settle back on the runway.
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