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## Homework Statement

Ions of type A with a charge of +2e and a mass of 4 amu (atomic mass units) and ions of type B

with a charge of +3e and a mass of 20 amu are at rest on one side of a cell wall. Both pass

through the cell wall which has a voltage difference of 1.5 volts across it. When the ions leave

the cell wall

(a) they have the same energy.

(b) ions A have 1/5 the energy of ions B.

(c) ions A have 2/3 the energy of ions B.

(d) ions A have 5 times the energy of ions B.

(e) ions A have 10/3 the energy of ions B.

## Homework Equations

I have a feeling that I need to use F = ma somewhere, but I'm not sure how to relate the energy to the charge. Maybe W = F*d? I'm really lost and muddled.

## The Attempt at a Solution

Alright, this is just a basic concept question that I missed on a quiz awhile ago. I'm not sure what equation to use to relate energy, charge and mass. In fact, I'm starting to mix up my electric field equations with my energy equations and things are just getting plain messy. I have a feeling that I need to us F=ma and I know there has to be an equation relating force and energy, I'm just not sure where or how to find it.

Any hints or tips would be really helpful; thanks.

Kris