Calculate the speed of a proton after it accelerates from rest through a potential difference of 380 v .

The magnitude of the change in potential energy is equal to the kinetic energy,

or                        

Here, V is potential difference, q is charge, m is mass and v is velocity.

We can also write,

Given  

Substituting this value with mass of proton, and charge of proton, we get

Therefore, the speed of proton is .