# Need help with a problem

1. Oct 5, 2004

### gto6570

I'm trying to figure out this problem and i am having no luck. Any help would be great.

a) How much voltage would be need, in order to accelerate protons from rest to 5.0x10 to the 6th m/s.
b) what is the kinetic energy of these protons in eV, after they hit the top speed indicated in part a?

2. Oct 5, 2004

### Tide

The amount of work done by the electric field is $E = q V$.

3. Oct 5, 2004

### aekanshchumber

try this

Try this,
qV=(m*v^2)/2
q= charge on proton, v= speed, m= mass

Kinetic energy, K= 0.5m*v^2 units will be in joules.
to convert it in eV divide it by 1.67*10^-19.
have better luck this time