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A stone tied to a string is rotated with...

A stone tied to a string is rotated with a uniforms speed in a vertical plane. If mass of the stone is `m`, length of the string is `r` and linear speed of the stone is `v`, then tension in the string, when the stone is at its lowest point, is `(g=` acceleration due to gravity)

A

`mg`

B

`(mv^2)/r`

C

`(mv^2)/r - mg`.

D

`(mv^2)/r + mg`.

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