Answer:
vx, ax and ay
Explanation:
During a typical flight, three quantities remain consistently zero:
- vx (horizontal velocity),
- ay (vertical acceleration), and
- ax (horizontal acceleration).
These remain constant because:
- vx: Cruising altitude involves minimal horizontal forces, resulting in steady horizontal speed.
- ay: Lift and weight balance in level flight, creating a constant upward acceleration of zero.
- ax: Similarly, with no significant horizontal forces acting on the aircraft, horizontal acceleration remains zero.
While other quantities like x, y, vy, and v change during takeoff, landing, and turbulence, vx, ay, and ax maintain their zero value throughout the flight.
