A scientific exploration probe is released from an atmospheric balloon into the dense atmosphere of Venus.
The probe is initially designed to descend using four identical deployable drag-ribbons.
After descending for a period of time, the probe reaches a constant velocity. State the name given to this constant velocity.
Explain, in terms of forces and acceleration, why the probe's velocity remains constant at this stage.
On a separate mission, an identical probe is deployed but only three of its four drag-ribbons successfully deploy. Explain how the final constant velocity of this second probe compares to that of the first probe.
On a different planet, a high-speed magnetic transit sled uses emergency mechanical friction brakes assisted by an aerodynamic drag-plate. Explain how the stopping distance of the sled would be affected if the aerodynamic drag-plate fails to deploy.