18. An airplane with a weight of 11000 N cruises at 180 km/h in level flight 2300 m above the ground. How much lift is acting on the plane? 19. How much net force is produced by a 30.0 N force and a 20.0 N force under the following situations:

11000 N

Explanation:

Without lift, the plane would have a downward acceleration of 9.8 m/s².

But since the plane is cruising at a constant velocity, the lift must counteract the gravitational force so that the net force is zero, which would be 11000 N.

increase masses, decrease separation

more than, less

less than, more