## Navier Stokes?

I need to answer this problem:
The interface between two media is positioned along the plane $x_3=0$. Medium 1 is a Newtonian incompressible fluid which occupies the region $x_3 \le 0$.
i)assuming the velocity and pressure fields in the fluid are given, determine the traction(?) that medium 2 exerts onto the fluid along the interface.
ii)now assume that only the velocity field in the fluid is known and that medium 2 is an inviscid fluid under pressure $p^{(2)}=P$. What is the fluid pressure at the interface?

Is this an application of the NS equations....I'm sorry for the vague question but I'm a little lost on how to approach the question...

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