In both systems, how did the starting thermal energy compare to the ending thermal energy of the system?

According to the (second) law of thermodynamics, the thermal energy of a system changes when work is done on the system. The thermal energy of a material (increases) when the temperature of the material increases. ... At the same temperature, 1 kg of water has (the same amount) of thermal energy as 2 kg of water.

im pretty sure its b