Question: how reusable is the falcon 9?
Answer: Both Falcon 9 v1.0 and Falcon 9 v1.1 were expendable launch vehicles (ELVs). The Falcon 9 Full Thrust made its first flight in December 2015. The first stage of the Falcon 9 Full Thrust version is reusable. The current version, known as Falcon 9 Block 5, made its first flight in May 2018.