Here are the answers to your questions:
Question 9: True or False. At the top of the first hill, the roller coaster has no kinetic energy.
Answer: True. At the highest point, the roller coaster's speed is at its lowest, which means its kinetic energy is at a minimum (potential energy is at a maximum). However, it does not necessarily mean the kinetic energy is zero unless stated that it has stopped completely.
Question 10: The potential energy of the roller coaster increases as it goes downhill.
Answer: False. As the roller coaster goes downhill, its height decreases, which results in a decrease in potential energy.
Question 11: True or False: Energy transformations in a roller coaster follow the law of conservation of energy.
Answer: True. The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another. In a roller coaster, potential energy is transformed into kinetic energy and vice versa during its motion.
Feel free to ask if you have more questions!
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