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A particle carries -4 e charge (i.e. q = -6.4E-19 C) and is free to move in region III. Its initial velocity is zero at

A particle carries -4 e charge (i.e. q = -6.4E-19 C) and is free to move in region III. Its initial velocity is zero at position x = 8 cm. When it leaves region III, what is the kinetic energy of this particle in eV (electron-volt)?

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