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