Two parallel plates are separated by 0.400 m. The voltage potential between the two plates is 800 V. A small plastic sphere that has a mass of 5.0 x 10^-8kg is accelerated across the gap between the two plates. The small sphere arrives at the second plate at a velocity of 120.0 m/s. Calculate the magnitude of the charge on the sphere and draw a diagram of the physical set up of this experiment.