Discussion
Assertion (A): The momentum integral equation can be solved without knowing the exact velocity profile.
Reason (R): It relates only integral quantities and the wall shear stress.
Select the correct answer from the options below.
Answer: A
Both are true and the second explains the first. Because the equation is written in terms of integrals across the layer, any reasonable assumed profile closes it, which is exactly what the Pohlhausen method does. The accuracy then depends on how good that assumption is.
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