Final answer:
The Law of Conservation of Energy states that energy cannot be created or destroyed, but is merely changed from one form into another. This law applies to various energy conversions, such as potential energy to kinetic energy. Therefore, the correct option is B.
Step-by-step explanation:
The Law of Conservation of Energy states that energy cannot be created or destroyed, but is merely changed from one form into another.
For example, when a rock is thrown into the air, its potential energy (due to its height) is converted into kinetic energy (due to its motion). This conversion of energy follows the law of conservation of energy.
Another example is a pendulum swinging back and forth. As the pendulum swings, it continuously converts between potential energy and kinetic energy, but the total amount of energy remains constant.