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## Homework Statement

Two horizontal plates connected to 600v with the positive at the top.

A positively charged ion between the plates moves downwards under the

force of the field (neglect gravity).

The ion has charge 1.6×10^–19C and mass 2.3×10^–26kg.

Show that the kinetic energy of the ion is 4.8x10-17 J at the instant

that it reaches the bottom plate.

## Homework Equations

KE = eV

## The Attempt at a Solution

eV = 1.6x10^-19 x 600 = 9.6x10^-17 J.

This is exactly twice the number I am trying to reach and I can't

get any further. The problem is that I don't understand the significance

of the ion reaching the bottom plate.

Thanks.

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