Given data
*The magnitude of the electric force is F = 6.40 × 10^-17 N
*The given length is d_1 = 6.40 cm = 0.064 m
The acceleration of the electrons is calculated as
The formula for the speed of the electron after it travels 6.40 cm is given by the third kinematic equation of motion as
Substitute the known values in the above expression as