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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 Z, the other end of which is fixed. It is given a horizontal velocity so that the string would just become slack, when it makes an angle of `60^@` with the upward drawn vertical. The tension in string at this at this position is
A. 4.5mg
B. 2 mg
C. 3 mg
D. `sqrt(mg)`

A

4.5mg

B

mg

C

3 mg

D

`sqrt(mg)`

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