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A stone is tied to a weightless string and revolved in a vertical circle of radius 5 m . What should be the minimum speed of the stone at the highest point of the circle so that the string does not slack ? What should be the speed of the stone at the lowest point of vertical circle ? Take ` g = 9.8 ms^(2) ` .

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The correct Answer is:
(i) `7ms^(-1)` (ii) `7sqrt(5) ms^(-1)`
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