Solving the equation we obtained in Problem 4 for $p$ in terms of $x$, we obtain
$p$ =
(Hints for solving for $p$: Exponentiate to get rid of the logarithm. Then isolate the square root on one side of the equation and square both sides.)

Recalling that $p=\frac{dy}{dx}$ and integrating. we obtain that
$y$ = $+C$

Plugging in the initial position of the hawk we obtain that the constant of integration is given by
$C$ =