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A stone of mass m is tied to a string of length $\ell$ and rotated in a circle with a constant speed v, if the string is released the stone flies
Explanation
In uniform circular motion, the body move with $v_{T}$ (tangential velocity) & $a_{c}$. If $a_{c} = 0$ then it implies that the body is no longer bound to rotate in circle & so no change in the direction of velocity. Hence it move tangentially to the circle outward with velocity $v_{T}$.