2.2 A fluid is contained between two parallel plates spaced a distance h apart. The lower plate moves at a constant velocity U and the upper plate is stationary. Determine which of the following velocity fields meets the appropriate boundary conditions, where x is the coordinate along the plates and y is the coordinate perpendicular to the plates with y = 0 at the lower plate.

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(a) u = U (b) u=U (c) u=U h h-y h h (d) u=U u=U(-1) (e) u=U( =U) 2