A stone of mass $1 kg$ is tied to end of a massless string of length $1 m$. If the breaking tension of the string is $400 N$, then maximum linear velocity, the stone can have without breaking the string, while rotating in horizontal plane, is:
(1) $20 ms^{-1}$
(2) $40 ms^{-1}$
(3) $400 ms^{-1}$
(4) $10 ms^{-1}$
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