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A man whirls a stone round his head on t...

A man whirls a stone round his head on the end of a string 4.0 metre long. Can the string be in a horizontal, plane? If the stone has a mass of 0.4 kg and the string will break, if the tension in it exceeds 8 N. The smallest angle the string can make with the horizontal and the speed of the stone will respectively be (Take `g=10 m/s^(2)`)?

A

`30^(@),7.7m//s`

B

`60^(@),7.7m//s`

C

`45^(@),8.2m//s`

D

`60^(@),8.7m//s`

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