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Solution: Two charged metal plates in vacuum are 0.15 m apart, with an...

Question

Two charged metal plates in vacuum are 0.15 m apart, with an electric field between the plates of E = 3000 N/C. A proton (q= +e = 1.6x10-19 C, m = 1.67x10 -27 kg) is shot with a speed of 2x105 m/s from the positive plate. What will be its speed before hitting the negative plate?