A stone tied to a thread is moved with a constant speed of 10 m/s along a circular path, but still its motion is said to be accelerated. Why?

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Dear Student,
Acceleration is the rate of change of velocity with respect to time. When stone moves in circular path though it's speed is same but velocity changes as direction changes as stone moves so, the stone is said to be in acceleration and motion is said to be accelerated.
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Although the speed is constant but the velocity is not constant. The stone experience a radial force which keeps on changing the direction of motion of stone without changing its speed. But there is a change in velocity, Therefore it is called an accelerated motion.

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