# Physics of Roller-Coasters#

A roller-coaster travels over a vertical, circular loop of radius $$R =$$ 24.8 $$m$$.

## Part 1#

If it travels without friction along the track, what is the minimum speed required at the bottom of the loop such that the roller-coaster remains in contact with the track at the top of the loop?

• 31.2 m/s

• 34.9 m/s

• 27.0 m/s

• 22.1 m/s

• 15.6 m/s

• 38.2 m/s