Answer:
Mass of the airplane, m = 562.5 slugs
Step-by-step explanation:
Given that,
Weight of the airplane, W = 18,000 lbs
The acceleration due to gravity is,

Let m is the mass of the airplane. The weight of an object is equal to the product of mass and acceleration due to gravity as :
W = m × g
m = 562.5 slugs
So, the mass of the airplane is 562.5 slugs. Hence, this is the required solution.