Which of the following remains constant in UCM?

Speed

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Kinetic energy

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Angular speed

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All of these

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Solution

The correct option is D All of these
When a body is moving on a circular track with constant speed then the motion of an object is known as uniform circular motion. During this motion magnitude of velocity or speed is constant but the direction of motion changes with respect to time. The sense of rotation and speed is constant so the angular speed and kinetic energy of the object will also be constant.
Option D

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