Assertion: coaster's speed | /r/HasProperty | high
Facets:
Source sentences:
text: If the speed of the coaster is too high when it goes over the crest of a hill, what happens?
text: A rollback occurs when a roller coaster has failed to reach a high enough speed to clear a hill, loop, or other vertical element.
text: If the speed of the coaster is too high when it goes over the crest of a hill, what happens?