I this is tricky one sec.. I would go with b
Answer:
There is some sort of "rollers" on the trail part that is used to make the roller coaster move when it is going up. Then because of that, the speed gets quicker when it drops down, so then it could move for a longer time until it reaches the next arch.
Explanation:
hope this helps :)
A warm room. sound travels faster in places with more excited molecules.
To know what is it. and i think that the reason behind your question is that PHYSICS IS DAMM HARD
