A particle (mass = 4.0 g, charge 80 mC) moves in a region of space where the electric field is uniform and is given by Ex = -2.5 N/C, Ey = Ez = 0. If the velocity of the particle at t = 0 is given by vy = 80 m/s, Vy = Vz = 0, what is the speed of the particle at t = 2.0 s? a. 40 m/s b.60 m/s c. 180 m/s d.80 m/s e. 20 m/s