Physics: Plane Mass, Wing Area & Lift Force

[ilovephysicssomuch]

An airplane has a mass of 1.60 x 10^4 kg and each wing has an area of 40.0 m^2. During level flight, the pressure on the lower wing surface is 7.00 x 10^4 Pa.
a) Determine the pressure on the upper wing surface.
b) Determine the lift force on the plane. Is it sufficient to lift the plane?

 

[Mindscrape]

What sort of work have you done so far?

 

[ilovephysicssomuch]

Answer

Well.. i get 68.0kPa
but my reasoning doesn't make sense.. i got confused and lost

 

[durt]

The force on the bottom of the wing is equal to the plane's weight plus the force due to the pressure above the wing. Plugging in the numbers, i got 66 kPa.
The second part makes no sense to me. "Is it sufficient to lift the plane?" Well its flying, isn't it? ...