An iron block of 20 kg undergoes a process during which there is a heat loss from the block at 4 kJ/kg, an elevation increase of 50 m, and an increase in velocity from 10 m/s to 50 m/s. During the process, which also involves work transfer, the internal energy of the block decreases by 100 kJ. Determine the work transfer during the process in kJ if the total energy remains constant. Include sign.