Answer:

Step-by-step explanation:
Given that
Mass = m
Electric filed = E
Initial velocity = 0 m/s
We know that
F= q E -----------1
F= m a --------2
a=Acceleration
F= Force
From equation 1 and 2
q E = m a
a= q E/m
We also know that

So
Vo = 0
V²= 0² + 2 q E/m x d

This is velocity of charge q after distance d .