character: Mr. Chen
topic: Potential Energy and Conservation of Energy
grade: 9
subject: Physics
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character: Mr. Smith
topic: Kinetic Energy Principles
grade: 9
subject: Physics
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character: Ms. Lee
topic: Mechanical Energy and its Conservation
grade: 9
subject: Physics
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character: Dr. Johnson
topic: Work-Energy Theorem
grade: 9
subject: Physics
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