Accelerate-go distance begins with accelerating to which speed with all engines at takeoff power?

• A. V1
• B. V2
• C. Vs
• D. Mach 1

Answer: (A)

This item tests understanding of V1 as the takeoff decision speed. Accelerate-go distance starts when you accelerate to V1 with all engines at takeoff power because V1 is the speed at which you must decide whether to continue or abort the takeoff. If an issue forces an abort before reaching V1, you can stop on the runway; once you pass V1, there isn’t enough runway left to stop safely, so you continue the takeoff. So the distance counted as accelerate-go begins from brake release up to reaching V1 under full takeoff power, and then the aircraft proceeds toward liftoff and climb. The other speeds don’t define this starting point: Vs is stall speed and relates to flight in the takeoff configuration, not the abort decision point; V2 is the minimum speed for safe climb after liftoff; Mach 1 is not a practical takeoff performance reference for this context.