In a uniform circular motion the speed continuously changes because of the change of ___ of the body.

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Speed is the distance traveled by a body in unit time. The speed of a body is independent of the direction in which it moves. The velocity of a body is the displacement in unit time. The velocity of a body is dependent on the direction of its motion. For instance, if a body goes up 5 m in a second or goes down 5 m in a second its speed is 5 m/s in both the cases, the velocity of the body...

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The question, as it stands, is flawed. Uniform circular motion, by definition, is motion in a circle at a uniform (constant) speed. It is thus incorrect to say that the speed continuously changes in uniform circular motion. To fix the question, the word “velocity” should be substituted in place of the word “speed.” Unlike speed, velocity is a vector, meaning it has both magnitude and direction. While the magnitude of the velocity (the speed) does not change, its direction does change. At any given instant during one of its revolutions, the body is moving in a different direction, thus its velocity is technically changing. This is known as centripetal acceleration.