Final answer:
The significance of this motion is that the electron is coming to a complete stop after moving at a certain velocity. This signifies a change in velocity and may be influenced by various factors such as forces opposing its motion or reaching the end of a path.
Step-by-step explanation:
The significance of the motion is that the electron is coming to a complete stop at point B after moving at 6.5 mm/s at point A. This signifies a change in velocity from non-zero to zero. In physics, this is known as deceleration or negative acceleration. It indicates a change in the electron's speed and direction of motion.
In this case, the electron is slowing down and stopping. The significance of this motion could be related to various factors such as the presence of a force opposing its motion or the electron reaching the end of a path or trajectory.