The stone moves in a straight line when released because it continues to move in the direction it was moving at the instant of release, following the principle of inertia.
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When the stone is released from its circular path, it moves along a straight line tangential to the circular path.
Uniform circular motion is the motion of an object moving in a circular path with a uniform speed.
The motion of the athlete along a circular path is considered an example of accelerated motion because, even though the magnitude of his velocity remains constant, there is a continuous change in the direction of his motion.
As the number of sides increases, the length of each side of the track decreases to a point.