Answer: Decreases.
- A Increases
- B Is conserved
- C Decreases
- D Becomes zero
Correct answer: C. Decreases
Explanation: In inelastic collisions, some KE is converted to heat, sound, or deformation energy. Total KE decreases.
As a pendulum swings, total mechanical energy (KE+PE) stays constant: at the highest points A and C, all energy is potential (zero speed); at the lowest point B, all of that energy has converted into kinetic energy (maximum speed).
Concept context
Work-energy theorem, potential energy, conservation of energy, collisions.