Answer:
By conservation of energy, it can climb up to a height equal to that it went down before. However, due to the friction in the machines, the total mechanical energy of the roller coaster will decrease. As a result, the first "hill" of many roller coasters are the highest, but the followings will have decreasing heights.
Explanation:
I’m pretty sure it’s average speed= total distance and total time which is A.
For B, it is because water is a really good conductor of electricity, so the electrician will get shocked
