Answer: [ML2T-2].
- A [ML2T-2]
- B [MLT-2]
- C [ML2T-1]
- D [MLT-1]
Correct answer: A. [ML2T-2]
Explanation: Work = force × displacement = [MLT-2][L] = [ML2T-2], the same as energy.
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.