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A body of mass m is rotated along a vert...

A body of mass m is rotated along a verticle circle with the help of a light string such that velocity of the body at any point is critical. If T1 and T2 are tensions in the string when the body is crossing the highest and lowest points of the vertical circle respectively, then

A

`T_2-T_1=6 mg`

B

`T_2-T_1 = 4 mg`

C

`T_2-T_1 =3 mg`

D

`T_2-T_1 =2 mg`

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