A man standing in an elevator on the third floor of a building. What is the primary factor that determines the man's kinetic energy?
Correct answer: C. Elevator's speed
- A. His height above the ground
- B. His mass
- C. Elevator's speed
- D. Elevator's direction of movement
Explanation
The primary factor that determines the man's kinetic energy is the elevator's speed. Kinetic energy (KE) is given by the formula:KE = (1/2) × m × v²where:m = mass of the man (which remains constant)v = velocity (speed) of the elevatorSince the man is standing in the elevator, his velocity is the same as the elevator's velocity. Therefore, the elevator's speed is the primary factor that determines the man's kinetic energy.
This question appeared on the KMU MDCAT 2023 (retake) paper, which you can sit online with every answer explained.
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About Kinetic Energy
Kinetic energy is the energy of motion, given for a nonrelativistic object by K = ½mv², so it depends on mass and the square of speed. Questions connect kinetic energy with work through the work energy theorem, calculate changes in kinetic energy, and distinguish it from momentum and potential energy.
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