A particle (mass = 4.0 g, charge = 26.5 mC) moves along the x-axis in a region of space where the electric field. is uniform and is given by Ex = -2.5 N/C If the velocity of the particle at t = 0 is given by vx = 80 m/s, what is the velocity of the particle at t = 2.0 s (in units of m/s)?

Three charges are located on the corners of a right-angle triangle as in the figure. If a=3.0mm,b=4.0mm, Q=59.4nC in the figure, what is the magnitude of the total electric force ( in units of N ) acting on the charge Q located at 4.0mm from the origin on the x-axis