4 ms·

The only one I can think of is Oblivion at Alton Towers. The main feature is a vertical drop section.

• philjohn 8y ago
  Not perfectly vertical, and you still have friction of the wheels on the track.
  • nielsole 8y ago
    note that also phones have air friction, so it might not be discernible
    • Piskvorrr 8y ago
      Yup. My phones tend to drop along ballistic trajectories, which is rarely a straight line towards the Earth-Moon barycenter ;)