Velocity of a proton after accelerated through potential

[Taryn]

hey Hoping that someone could possibly help me start this problem... I don't know which formula to use... maybe something to do with Kinetic energy... but like I said I am not sure how to start this problem!
Thanks for your time... here is the question!

A proton is accelerated from rest through a potential of 6.3 × 105 V. What is its final speed in m/s? (mp = 1.673 × 10-27 kg.)

Its really simple I know but for someone reason it has me stumped

 

[arunbg]

Hint: W = qV
where V is p.d and q the charge.
The work done by the p.d is converted to the KE of the particle.

 

[Taryn]

thanks I think me got the answer now thanks!