Work-Energy Theorem for a Single-Object System
A pendulum bob, considered as a single-object system, swings back and forth. Which of the following statements correctly describes the energy of this system?
A
The bob’s PE increases as it swings to maximum height
B
The bob’s KE changes while external forces do work on it
C
The bob’s total energy remains constant throughout
D
The bob’s energy alternates between KE and PE
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