A particle is moving in a horizontal circle with constant speed. It has constant:

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Accepted Answer

1.  **Velocity:** In uniform circular motion, while the speed (magnitude of velocity) is constant, the direction of motion changes continuously at every point. Since velocity is a vector quantity involving both magnitude and direction, it is not constant .
2.  **Acceleration:** The particle experiences centripetal acceleration directed towards the center of the circle. Although its magnitude ($v^2/R$) is constant, its direction changes continuously as the particle moves. Thus, the acceleration vector is not constant .
3.  **Kinetic Energy:** Kinetic energy is a scalar quantity defined as $K = \frac{1}{2}mv^2$ . Since the mass ($m$) and speed ($v$) are constant, the kinetic energy remains constant throughout the motion.
4.  **Displacement:** Displacement is a vector connecting the initial position to the final position. As the particle moves, its position changes, so displacement is not constant.

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