An isolated system A initially consists of a deuterium molecule, D2 , and an oxygen atom, O, confined within a fixed volume V. e constituents of A are in a ground-energy state. As a result of a spontaneous fusion reaction between the two D atoms, the constituents of A are transformed into a tritium atom, T, a neutron, n, and an oxygen atom, O, that have an overall kinetic energy of 3.2 MeV.

(a)  What is the change of energy of system A?

(b) What is the change in value of the sum of the ground-state masses of the free constituents of system A?