Consider a gas with density $\rho $ and $\bar c$ as the root mean square velocity of its molecules contained in a volume. If the system moves as whole with velocity $v,$ then the pressure exerted by the gas is
  • A$\frac{1}{3}\rho \,{\bar c^2}$
  • B$\frac{1}{3}\rho {(c + v)^2}$
  • C$\frac{1}{3}\rho {(\bar c - v)^2}$
  • D$\frac{1}{3}\rho {({c^{ - 2}} - v)^2}$
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