A hot copper block at initial temperature \(T_b\) is placed into an insulated container filled with cool water at initial temperature \(T_w\), where \(T_b > T_w\). Thermal energy is exchanged only between the copper block and the water until the system reaches thermal equilibrium at temperature \(T_f\). Which of the following correctly describes the direction of net thermal energy transfer and the value of the final equilibrium temperature \(T_f\)?