What is the correct V-speed indicated by the shown indicator?

The selected answer indicates that Vso is '55 knots. Vso is the stall speed in a specified landing configuration; it is critical for pilots to understand this speed for safe aircraft operation, particularly during approaches and landings.

When the aircraft is in a landing configuration—flaps extended and gear down (if applicable)—the stall speed will be the minimum airspeed at which the aircraft can maintain controlled flight. Understanding Vso allows pilots to maintain a safe margin above this speed during approach and landing to prevent stalling, which could lead to a loss of control.

In this case, the value of 55 knots means that the aircraft must not drop below this speed to avoid stalling while landing. Recognizing and adhering to this speed is essential for safe flight operations.