A plane is in level flight at a constant speed such that the speed of the air below the wings is 144 km h -1 and above the wing is 180 km h -1 . If each of its wings has an area of 25 m 2 , then the mass (in kg) of the plane is [ 
= 1 kg m -3 , g = 10 m s -2 ]
Text Solution
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CHECK THE SOLUTION.
(2250)
Given,
A = 25 m 2 [area of each wing]
[speed of the air above the wing]
[speed of the air below the wing]
According to Bernoulli's theorem
The lifting force acting on the plane is
P x A total = 450 x 50 N = 22500 N
Mg = 
P x A total
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