An electron starts from rest 72.5 cm from a fixed point charge with Q=-0.125µC. How fast will the electron be moving when it is very far away?(adsbygoogle = window.adsbygoogle || []).push({});

The answer the book says is 2.33 x 10^7 m/s, but I don't know how they got that answer.

The equation I think I need to use is V=k(Q/R)

So I plugged in the numbers: V= (9.0 x 10^9)(-1.25 x 10^-7) /.725 m

and got -1551.7 V (I got -1.25 x 10^-7 for Q b/c µ is10^-6 so I multiplied the two together)

The trouble I'm having is I don't know how to convert V into m/s. What equation would I use?

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# Homework Help: Electric potential word problem

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