Answer: 10 J.
- A 6 J
- B 8 J
- C 10 J
- D 12 J
Correct answer: C. 10 J
Explanation: W = ∫(2x + 3)dx from 0 to 2 = [x² + 3x] = 4 + 6 = 10 J.
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.