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9A stone of mass 1 kg tied to a light in...

9A stone of mass 1 kg tied to a light inextensible string of `"length"L=(10)/(3)m`is whirling in circular path of radius L in a vertical plane. If the ratio of the maximum tension in the string to the minimum tension in the string is 4 and if g is taken to be 10m / sec2, the speed of the stone at the highest point of the circle is

A

`20 m//sec`

B

`10 sqrt(3)m//sec`

C

`5sqrt(2) m//sec`

D

`10 m//sec`

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The correct Answer is:
D
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