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The problem specifies that the fluid material is water while the default assignment is air. Once inside the Physics template select Material assignmentAssignments. Under the Materials drop Material drop down menu select Water Water (Material Samples). 

Boundary Conditions / Forces

Since this problem statement only specified the lid of the box as moving, we assign a wall condition to the top face of the volume. Select the Physics task.  In the Fluid Flow Conditions section, press Add > Wall and select the top face of the flow volume. In the Flow Specification, change Wall velocity from Stationary to Moving and specify the Magnitude as 1 [m s^-1], as given in the problem description. Now that the wall is moving, a direction must be specified by inputting a value in the Cartesian Direction Components. Either X or Z can be 1, but the rest Input 1 as X while Y and Z must be zero. See below for an example.

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