Question

What potential difference is needed to accelerate a he+ ion (charge +e, mass 4u) from rest to a speed of 1.8×106 m/s ?

Answer 1

q = +e = 1.6 x 10^-19 C
m = 4u = 4 x 1.66 x 10^-27 kg
vi = 0
vf = 1.7 x 10^6 m/s

Let potential difference = V
q V = (1/2)*m*(vf^2 - vi^2)
Can you substitute values and calculate V?