a. An electron is at rest in an inertial frame. Calculate the work needed to accel- erate it to a speed of 0.990c. 5. The total annual energy consumption of Canada is about 9.80 X 10'3 J. How much mass would have to be totally converted to energy to meet this need? 6. The rest mass energies of a proton and a neutron are 938.3 MeV and 939.6 MeV, respectively. What is the difference in their rest masses in kilograms