# Homework Help: Electric field question

1. Feb 6, 2005

### ballahboy

A proton accelerates from rest in a unifor electric field of 640 N/C. At some later time, its speed is 1.20X10^6m/s. Find the magnitude of the acceleration of the proton.

Hmm.. not sure what formula to use on this one.. can someone help?

2. Feb 6, 2005

### christinono

You can use the formulae:

$$F_{net} = ma$$

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

3. Feb 6, 2005

### ballahboy

hmm im lookin for a right? so what am i suppose to plug in for m and q?
im confused..

4. Feb 6, 2005

### christinono

m = the mass of a proton
q = the charge of a proton

5. Feb 6, 2005

### ballahboy

yeah i got that but its not given in the problem..

6. Feb 6, 2005

### christinono

Don't you have a data sheet in your book. If not, I can give the values to you.

7. Feb 6, 2005

### ballahboy

hmm.. is it m=1.67x10^-27? what is q?

8. Feb 6, 2005

### christinono

Yes, and q is $$1.60 \times 10^{-19}C$$

9. Feb 6, 2005

### ballahboy

ok thanks a lot!! i reallly appreciate it :-D

10. Feb 6, 2005