Fluid mechanics. Plate pulled within viscous fluid.

[thepatient]

Homework Statement

I have the statement, variables and given/known data in the picture along with relevant equations and solution attempt.

Homework Equations

The Attempt at a Solution

I think I did the first part right. But I'm unsure about part B. The distance between the plate t is different between the stationary plate above than the distance below the plate to the stationary plate. Computing using the different distances give me a different value. I'm unsure what I'm doing wrong or what assumption is incorrect.

Any help would be appreciated. Thanks. :]

 

[thepatient]

I was thinking maybe the shear isn't the same on both sides of the plate in part b?