A particle of mass 0.000141 g and charge 18 mC moves in a region of space where the electric ?eld is uniform and is 5.4 N/C in the x direction and zero in the y and z direction. If the initial velocity of the particle is given by vy = 2.5 × 105 m/s, vx = vz = 0, what is the speed of the particle at 0.6 s? Answer in units of m/s.