Final answer:
Scenario B) Swinging pendulum at its highest point is where kinetic energy transforms into potential energy as the pendulum comes to a brief stop at its highest swing before moving back down.
Step-by-step explanation:
Of the scenarios provided, the one that represents kinetic energy transforming into potential energy is B) Swinging pendulum at its highest point. As a pendulum swings upward, the kinetic energy it had while moving is converted into potential energy at the point where it stops momentarily before swinging back down. This conversion of energy aligns with the concept that energy cannot be created or destroyed, but only changed from one form to another, as described by the law of conservation of energy.
Considering other options, A) A roller coaster at the top of a hill represents potential energy being at its peak before converting to kinetic energy as the coaster descends. C) Water flowing downstream is an example of potential energy already converted into kinetic energy, and D) An object falling freely from a height is converting potential energy into kinetic energy as it falls.