Triple Integrals & Coordinate Systems · Superchallenge problem

Let $B$ be the solid unit ball $x^2 + y^2 + z^2 \le 1$ and $Q = (0,0,2)$. Evaluate $\displaystyle\iiint_B \dfrac{dV}{\sqrt{x^2 + y^2 + (z-2)^2}}$, the gravitational potential of the ball at $Q$ (up to a constant). Give your answer in terms of $\pi$.