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In the figure a charged particle (either an electron or a proton) is moving rightward between two parallel charged plates separated by distance d = 7.50 mm. The plate potentials are V1 = –73.0 V and V2 = –48.0 V. The particle is slowing from an initial speed of 84.0 km/s at the left plate. (a) Is the particle an electron or a proton? (b) What is its speed just as it reaches plate 2?