A proton moves along the x axis according to the equation x-34 t + 12 t, where x is in meters and t is in seconds. Calculate (a) the average velocity of the proton during the first 3.0s of its motion. (b) the instantaneous velocity of the proton at t = 3.0 s, and (c) the instantaneous acceleration of the proton at t - 3.0 s. (a) Number i (b) Number i (c) Number Units Units Units