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A particle of mass m is suspended from a...

A particle of mass m is suspended from a ceiling through a string of length L. The particle moves in a horizontal circle of radius r such that r `=L/(sqrt2)`. The speed of particle will be :

A

`sqrt(rg)`

B

`sqrt(2rg)`

C

`2sqrt(rg)`

D

`sqrt((rg)/2)`

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