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9. A stone of mass 0.25 kg tied to the end of a string iswhirled round in a circle of radius 1.5 m with aspeed of 40 rev/min in a horizontal plane. What isthe tension in the string? What is the maximumspeed with which the stone can be whirled aroundif the string can withstand a maximum tension of200 N?[Ans :6.6 N; 35 ms 1

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