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fubag

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**[SOLVED] Conservation of Energy**

## Homework Statement

A proton (charge e, mass = 1.67 * 10^-27 kg) accelerates from rest by crossing a potential difference V = 3.00 V

a.) Find the velocity v_0 it acquires?

(Suppose this proton, having initial velocity v_0 from part (a), moves from very away directly towards a stationary heavy ion which is singly charged, i.e. having the same charge as the proton, +e.)

b.) Find the distance r_min between the proton and the ion at the moment of closest approach?

c.) Find velocity v of a proton when it is at a distance r = 2r_min from the ion

## Homework Equations

a = (q/m)E

V = kQ/r

V = E*d (parallel plate)

## The Attempt at a Solution

I am literally stuck for part a into determining what it could be, it seems something is missing in the problem.

Please help.

Thanks!