A system undergone a process 1-2 in which it absorbs 100kJ energy as heat and does 40kJ work. Then it follows another process 2-3 in which 50 kJ work is done on it while it rejects 30kJ as heat. If it is desire to restore the system to the initial state by an adiabatic path, calculate the work and heat interaction during this process. Also determine the net work and the heat interaction.[80kJ, 0, 70kJ, 70kJ]