A light container having a diatomic gas enclosed with in is moving with velocity v. Mass of the gas is M and number of moles is n. The kinetic energy of gas w.r.t. ground is

The kinetic energy of gas w.r.t. centre of mass of the system  K.E. = 52nRTKinetic energy of gas w.r.t. ground = Kinetic energy of centre of mass w.r.t. ground + Kinetic energy of gas w.r.t. centre of mass.K.E. = 12MV2+52nRT