1. Homework Statement
A proton is released from rest at point B, where the potential is 0 V. Afterward, the proton:
a. Remains at rest at B.
b. Moves toward A with a steady speed.
c. Moves toward A with an increasing speed.
d. Moves toward C with a steady speed.
e. Moves toward C with an increasing speed.
$$U = qV$$
The Attempt at a Solution
The correct answer is c, but I am having a hard time understanding why. Charged particles may increase or decrease in speed if they are in an area with an electric potential. In this case, we have a potential difference - -100 V to 100 V - but how do I determine what $V$ is equal to. The potential difference could be positive in one sense and negative in the other.
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