Answer: 1:2.
- A 1:1
- B 2:1
- C 1:4
- D 1:2
Correct answer: D. 1:2
Explanation: Since p = √(2mKE) and KE is equal, p ∝ √m. So the ratio is √1 : √4 = 1:2.
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.