homework and exercises - Knowing the mass and force acting on a particle, how do we derive the relativistic function for velocity with respect to time?

Use this scenario:

An electron gains speed in the Stanford Linear Accelerator (SLA) across 3000 meters, reaching a final velocity of 0.95c due to a constant force pushing on the electron. Given the mass of the electron and the constant force pushing on the electron, what is the function for velocity in terms of time?

How do we derive this?