Acceleration due to gravity on the surface of a planet is given by, \(g=\frac{G M}{R^2}\)

\(M \rightarrow\) Mass of the planet

\(R \rightarrow\) Radius of the planet

Also, \(M=\frac{4}{3} \pi R^3 \times \rho\)

\(\Rightarrow g=\frac{G}{R^2} \times \frac{4}{3} \pi R^3 \rho=\frac{4}{3} \rho G \pi R\)

\(\rho \rightarrow\) Density of the planet.

\(\Rightarrow\) Acceleration due to gravity \(\alpha \rho R\)

\(\Rightarrow \frac{g_{\text {planet }}}{g_{\text {earth }}}=\frac{2 \rho_e \times 1.5 R_e}{\rho_e \times R_e}=3\)

\(\Rightarrow\) Acceleration due to gravity on the surface of planet is \(3\) times that on the surface of earth.