An Electron Is Projected Horizontally with a Speed of 5 $\times$

An electron is projected horizontally with a speed of 5.0 $\times$ 10⁶ m exactly in the middle of two parallel plates at potentials of -40 V and 104 V,respectively.The plate separation distance is 3.0 cm.The plates are long enough that the proton,rather than passing completely between the plates,eventually strikes the plate sitting at 104 V potential.What is the speed of the proton when it strikes the plate? The mass of the electron is 9.11 $\times$ 10^-31 kg.

A) 8.7 $\times$ 10⁶ m/s
B) 7.1 $\times$ 10⁶ m/s
C) 6.0 $\times$ 10⁶ m/s
D) 5.0 $\times$ 10⁶ m/s

Correct Answer:

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