Protons, which have a kinetic energy of 7.5 MeV, move in the +x direction. They enter a region of uniform magnetic field pointing into the plane of the page with a magnitude of B = 0.14 T. The region extends from x = Oto x = 2.0 m. a} Determine the y component of a proton's momentum as it exits the magnetic field region. b} Find the angle between the initial velocity vector as the protons enter the field and the final velocity vector as the protons exit the field region.