Answer: work done.
- A impulse
- B power
- C work done
- D momentum
Correct answer: C. work done
Explanation: Work is the integral of force over displacement, W = ∫F dx, which is the area under the F-x curve.
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.