a. the potential at points A and B b. the potential difference between A and B c. the potential energy of a proton at A and B d. the speed at point B of a proton that was moving to the right at point A with a speed of 4.0 x 10$ m/s the speed at point A of a proton that was moving to the left at point B with a speed of 1.0 x 105 m/s е.

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