Some forms of cancer can be treated using proton therapy in which proton beams are accelerated to high energies, then directed tocollide into a tumor, killing the malignant cells. Suppose a protonaccelerator is 7.3 m long andmust accelerate protons from rest to a speed of 8.0*106 m/s. Ignore anyrelativistic effects and determine the magnitude of the averageelectric field that could accelerate these protons.