(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A proton, initially at rest, is accelerated through an electric potential difference of 500V. What is the speed of the proton?

2. Relevant equations

V=k(q/r)

Solving for r: r=k(q/v)

v=d/t

known charge of a proton: 1.6E-19C

known value of k: 9E9Nm^2/C2

3. The attempt at a solution

I tried solving for r to get a distance.

r= (9E9Nm^2/C2)(1.6E-19C)/ 500V

r= 2.88E-12m

v=d/t

v= (2.88E-12m)/1 s

v= 2.88E-12 m/s

Our professor gave the answer as 3.1E5 m/s, but I cannot get to this answer. Any help would be greatly appreciated!!

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# Homework Help: Speed of Proton (given electric potential difference)

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