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A body of mass 4 kg is moved in a vertic...

A body of mass 4 kg is moved in a vertical circle with sufficient speed. Its tangential acceleration, when the string makes an angle of `30^@` with the vertical downward is

A

`4 m//s^2`

B

`5 m//s^2`

C

`8 m//s^2`

D

`7.8 m//s^2`

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