At time t = 0, a proton is accelerated very briefly, with acceleration (1: : mfs2. Detectors of are placed at an observation location a distance d = 15 m from the initial position of the proton, in the direction shown in the figure. The angle 9 is 45 degrees. A short time after the proton accelerates, radiation is detected at the observation location. observation location At the observation location, what is the direction of a