A closed system initially at rest on the surface of the earth undergoes a process for which there is net energy transfer to the system by work of magnitude 120 KJ. There is also heat transfer from the system to the surroundings of magnitude 35 KJ. At the end of the process, the system has a velocity of 100 m/s and an elevation of 80 m. The mass is 20 kg and g=9.81 m/s^2. Find the change in internal energy of the system. [Selected Answers: ?U= -30.696 KJ] please answer as soon as possible

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