photo of a launching ...
Museums in San Diego picture -
displayed in the hangar deck. The aircraft goes to full power just before launching. Then the catapult propels it about 200 feet (60+ m) along the deck from zero to 160 mph (260+ km/h) in 3 seconds quite a few Gs. The two catapults, one on either side of the deck, can launch a plane every 45 seconds.