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A body of mass 2 kg is attached to a cor...

A body of mass 2 kg is attached to a cord and whirled in a vertical 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

A

10 `m//s`

B

6.3 `m//s`

C

7 `m//s`

D

5 `m//s`

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