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A particle is resting on an inverted con...

A particle is resting on an inverted cone as shown. It is attached to cone by a thread of length 20 cm. String remains parallel to slope of cone. The cone is givenangular acceleration of `0.5 rad//sec^(2)` then at what time does mass leave contact with surface (assuming sufficient friction) :

A

`20 sec`

B

`10 sec`

C

`40 sec`

D

`5 sec`

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