You are presented with the question "Roller coaster work the same as any object having mass being pulled how on a planet" and the following answer choices: 
- body
 - trains
 - left
 - intermittently
 - down
 - feet
 - Lift
 - sideways

Now knowing that gravity causes objects that have mass to be pulled down on a planet and and roller coasters work with gravity, choose the best answer.


 

     down    