For some additional reference here's a link to a detailed study of FA18 catapult end speeds:
https://trace.tennessee.edu/cgi/viewcontent.cgi?article=3489&context=utk_gradthes
The F/A18C NATOPS Flight Manual also discusses catapult end speeds in Section 8.2.8
Link to NATOPS: https://publicintelligence.net/u-s-navy-f-18-natops-flight-manuals/
FWIW