Describe how shock cords are used in recovery systems.

The correct answer highlights that shock cords play a crucial role in connecting the rocket body to the recovery device, such as a parachute. This connection is vital for ensuring that when the rocket reaches apogee and begins its descent, the recovery device deploys safely and effectively. The shock cord absorbs the forces generated during this process, allowing the recovery device to deploy without damaging the rocket. Properly designed shock cords help to ensure a gentle and controlled deployment, which contributes to the successful recovery of the rocket.

The function of the shock cord is not related to increasing speed during launch, replacing the need for parachutes, or connecting the launch pad to the rocket. Each of these other options describes elements that do not pertain to the primary role and significance of shock cords in a recovery system. Understanding this connection is fundamental to safe rocketry practices and the design of effective recovery systems.