A cubic vessel (with face horizontal + vertical) contains an ideal gas at NTP. The vessel is being carried by a rocket which is moving at a speed of $500 {\mathrm{ms}}^{-1}$ in vertical direction. The pressure of the gas inside the vessel as observed by us on the ground [NCERT Exemplar]

remains the same because motion of the vessel as a whole does not affect the relative motion of the gas molecules and the walls

will increase by a factor equal to $({\mathrm{v}}_{\mathrm{rms}}^2 + {\left(500\right)}^2)/{\mathrm{v}}_{\mathrm{rms}}^2$ where v_rms was the original mean square velocity of the
gas.

remains the same because $500 {\mathrm{ms}}^{-1}$ is very much smaller than v_rms of the gas

will be different on the top wall an bottom wall of the vessel