What does V2 represent during takeoff?

V2 represents the takeoff safety speed during the takeoff phase of flight. It is critical because it is the minimum speed at which the aircraft can safely climb following an engine failure after takeoff. This speed is established to ensure that the aircraft has adequate performance margins to maintain control and safely gain altitude in case of an emergency.

At V2, the aircraft is able to achieve a positive climb rate, which is essential for the safety of the aircraft and its occupants. Pilots use this speed as an important reference point during their takeoff procedures, especially during the critical phases of flight where engine performance and aircraft handling need to be maximized.

In this context, while the other options represent important flight speeds, they do not accurately define V2. Decision speed refers to the speed at which a decision must be made to continue or abort the takeoff, climb-out speed is related to the aircraft's performance during the initial climb, and landing approach speed pertains to speeds during the landing phase. Understanding the specific role and definition of V2 is fundamental for pilots in ensuring safe takeoff operations.