According to kinetic theory of gases,
Energy of diatomic gas having
f number of degree of freedom is given as,
E1=nRT [For
n mole gas]
Since, degree of freedom of a diatomic gas,
f=5 ∴ Kinetic energy of diatomic gas with respect to centre of mass,
E2=nRT E2=nRT Kinetic energy of gas with respect to ground
= KE of centre of mass with respect to ground +KE with respect to centre of mass
=Mv2+nRT