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A small sphere is given vertical velocit...

A small sphere is given vertical velocity of magnitude `v_0=5ms^-1` and it swings in a vertical plane about the end of a massless string. The angle `theta` with the vertical at which string will break, knowing that it can withstand a maximum tension equal to twice the weight of the sphere, is

A

`cos^(-1) (2/3)`

B

`cos^(-1)(1/4)`

C

`60^@`

D

`30^@`

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The correct Answer is:
B
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