When the forces are balanced that means the acceleration downward (from gravity) is negated by the acceleration upwards (from air resistance). Acceleration is the rate of change of velocity with respect to time. read more
When the forces are balanced that means the acceleration downward (from gravity) is negated by the acceleration upwards (from air resistance). Acceleration is the rate of change of velocity with respect to time. So, having the net acceleration go to zero means the velocity will stop changing. read more