What is the takeoff roll (ground roll)?
1) The distance covered by an aircraft from the start of the takeoff run until it becomes airborne
2) The distance covered by an aircraft from the start of the takeoff run until it reaches its rotation speed
3) The distance covered by an aircraft from the start of the takeoff run until it reaches its liftoff speed
4) The distance covered by an aircraft from the start of the takeoff run until it reaches its takeoff speed