Gravity causes objects that have mass to be pulled down on a planet.
And roller coasters work with gravity.
Roller coaster work the same as any object having mass being pulled down on a planet.
Roller coaster work the same as any object having mass being pulled how on a planet
Options:
(a) body
(b) trains
(c) left
(d) intermittently
(e) down
(f) feet
(g) Lift
(h) sideways