Solution
= Solution
The momentum equation from part (c) is
$$
p_1-p_0=\frac13\rho_0V^2.
$$
Since $p_1-p_0=3p_0$, it follows that
$$
\rho_0V^2=9p_0,
\qquad
\boxed{V=3\sqrt{\frac{p_0}{\rho_0}}}.
$$
This completes the <piston-driven shock with specific-heat ratio three> calculation.