A passenger with a mass of 140,000 kg flies at a constant velocity of 220 m/s at an altitude of 11,000 meters. What net force acts on the plane?

The force that is acting upon the plane is simply force due to gravity. To solve, we use Newtons first law:

F = m a

where m is mass of the object, a is acceleration due to gravity = 9.8 m/s^2

Calculating for F:

F = 140,000 kg * 9.8 m/s^2

F = 1,372,000 N