Question

In the figure below, an electron is moving rightward between two parallel charged plates separated by distance d = 2.40 mm. The particle is speeding up from an initial speed of 3620 km/s at the left plate.

｜　　　　　　｜
｜ ○→　 　　｜　　
｜　　　　　　｜
-70V -50V

What is its speed just as it reaches the plate at the right? ?km/s

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