An external force does negative work on an electron so it moves at constant velo

Question

An external force does negative work on an electron so it moves at constant velocity from a point in space where magnitude of absolute potential (sign unknown) is ?185V to a point in space where the absolute potential is -55V. The two points are separated by 1 cm.

Find what sign the 185V has (positive or negative) and the change in kinetic energy of the electron, clearly stating if it increases or decreases.
Using this result, and the fact that the external force does negative work, to show the potential energy of the electron decreases.

Explanation / Answer

it is negative.. becuase since we are doing negative work.. hence the force is in the direction opposite to direction of electron's movement... naturally electron will go without effort from -185 to -55 .. but we are trying to stop it.. hence the conclusion. :)

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