The acceleration in the air with the resistance force is 4.8 m/s².
The acceleration depends on the force applied to the system. According to second Newton's Law, the force applied to an object will be proportional to mass and acceleration. Hence, it can be written as
F = m . a
where F is force, m is mass and a is acceleration
From the question above, we know that
Fup = 500 N
m = 100 kg
g = 9.8 m/s²
Find the total net force applied to system
F = W - Fup
F = m . g - 500
F = 100 . 9.8 - 500
F = 980 - 500
F = 480 N
Calculate the acceleration
F = m . a
480 = 100 . a
a = 4.8 m/s²
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