An agile team’s velocity is dependant on how many stories were picked up in a sprint and executed. Scrum framework lays emphasis on committing to work with sustainable pace. Basically, velocity is the speed at which the team moves forward.
Leadership lays a lot of importance on how the agile teams can be made more productive and efficient. That brings down to scrum master ownership, on how he can help the teams to improve the velocity over a period of time.
Some of steps that can be beneficial in improving the velocity are: