A charged particle is moving to the right between 2 plates. The plate on the left has a voltage of −70 V and the plate on the right has a voltage of −50 V. The initial speed of the charge is 90,000 m/s. The particle slows down as it moves toward the right plate. The plates are separated by .002 m a) Is the particle a proton or electron? b) What is its speed just as it gets to the second plate?