A body of mass 2 kg attached to a cord and whirled in a verticle circle of radius 2 m. The minimum speed at the bottom of the circle so that the cord will not slacken when the body rounds the top of the circle will be `(g=10 m//s^(2))`
A. `10 m//s`
B. `6.3 m//s`
C. `7 m//s`
D. `5 m//s`

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Correct Answer - A
`v=sqrt(5gr)=sqrt(5xx10xx2)=10m//s`

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