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A body of mass m hangs at one end of a s...

A body of mass m hangs at one end of a string of length l , the other end of which is fixed. It is given a horizontal velocity so that the string would just reach where it makes an angle of `60^(@)` with the vertical. The tension in the string at mean position is

A

2mg

B

mg

C

3mg

D

`sqrt3mg`

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The correct Answer is:
A
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