Recall the work-energy theorem: work must be done on a particle to increase its kinetic energy. The energy bills for accelerators are very high because of the increasing energy cost as particles approach the speed of light. CERN's energy use is almost 1/2 that of the city of Geneva! (10) (a) How much work must be done on a proton in the accelerator ring at CERN to increase its speed from rest to 0.6c