# Homework Help: Maximum distance of charge

1. Mar 1, 2012

### dminus

1. The problem statement, all variables and given/known data

A charge of -0.061 C is intiialy moving to the right with a velocity of 54m/s. It is moving in an electric field of 888N/C to the right, and has a mass of 0.72 kg. What is the maximum distance the charge moves to the right? What velocity does it have when it returns to the origin? What velocity does it have at x=5.75m?

2. Relevant equations

I don't know how to start.

3. The attempt at a solution

I tried using the electric field E=kq/r2but I can't get the solution.

I been looking at this problem blankly for a good two hours now and I could not find anything with google. Here is the link to the problem and solution.

http://books.google.com/books?id=vN...the origin has a magnitude of 845 N/C&f=false

Page 96 question 3.46

Last edited by a moderator: Mar 1, 2012
2. Mar 1, 2012

### gomboc

This problem might sound a little harder than it actually is.

All you need to notice that an electric field exerts a force on a charged particle given by

$$\vec{F}=q\vec{E}$$

Once you consider that force, the problem can be solved with the usual high school mechanics techniques. (conservation of energy, anyone?)

3. Mar 1, 2012

### dminus

Ty, I got the same solution as the book. I guess I was over thinking such a simple problem.