Vertical Velocity (V2) is an inverted steel roller coaster located at Six Flags Great America in Gurnee, Illinois.Manufactured by Intamin under the trade name Twisted Impulse Coaster, this launched shuttle-style coaster, located in the Yankee Harbor section of the park, has been operating since May 18, 2001.The coaster's single seven-car (28-passenger) train runs along a 200 m (656 ft) U-shaped track, incorporating two 185-foot (56 m) vertical spikes.