Fact 1: Gravity causes objects that have mass to be pulled down on a planet.

Fact 2: And roller coasters work with gravity.

Given the two facts above, answer the question "Roller coaster work the same as any object having mass being pulled how on a planet" with the following options: 
- body
 - trains
 - left
 - intermittently
 - down
 - feet
 - Lift
 - sideways


 

     down    