Learjet with 66000 N weight at constant velocity

[manu248]

Homework Statement

Assume a 8-passenger learjet has a force of gravity of 66000 N [down] acting on it as it travels at a constant velocity of 640 km/hr [W]. if the forward thrust provided by the engines is 13000 N [W], determine:

a - the upward life force on the plane
b - the force due to air resistance on the plane

Homework Equations

The Attempt at a Solution

i have absolutely no clue on how to even begin, I am so lost. please help, thanks.

 

[cepheid]

1. Is the plane accelerating the vertical direction (up or down)?
2. What does this imply about the total vertical force acting on it?

3. Is the plane accelerating in the horizontal direction?
4. What does this imply about the total horizontal force acting on it?