Question

Why the velocity of a body changes when direction is changed even though when the speed is constant?
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Answer 1

Yes. Even though the initial and final speeds are the same, there has been a change in direction for the object. Thus, there is an acceleration. ... This explains why an object moving in a circle at constant speed can be said to accelerate - the direction of the velocity changes.

Answer 2

Answer:

As mentioned earlier in Lesson 1, an object moving in uniform circular motion is moving in a circle with a uniform or constant speed. The velocity vector is constant in magnitude but changing in direction. It is accelerating because the direction of the velocity vector is changing. ...