Mae is going for a roller coaster ride. She's excited because she never experienced riding one. When the ride starts, it slowly move upward, then suddenly the engine turned off and they began to move faster as they go down. Eventually, the roller coaster stops and Mae is still wondering why they move so fast downward even when the engine was turned off and slows down when they go upwards.

1. From the situation above, explain how the conservation of energy is applied?​