Prove the principle of conservation of energy [Theorem 9.14,page 229]
This follows from the corresponding theorem for systems of particle, Theorem 7-7, page 169. The total kinetic energy T is the sum of the kinetic energy of translation of the center of mass plus the kinetic energy of rotation about the center of mass, i.e.,
It V is the potential energy, then the principle of conservation of energy states that if E is a constant