A particle having mass 5.0g and charge 40 uC moves in an area of space where the electric filed is uniform and is given by Ex = 2.5 N/C, Ey = Ex = 0. When the velocity of the particle at t = 0 is given by vy= 50 m/s, vx = vz = 0, then determine the speed of the particle at t = 2.0s?
i) 81 m/s
ii) 72 m/s
iii) 64 m/s
iv) 89 m/s
v) 25 m/s