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A ball of mass m by means of two massles...

A ball of mass m by means of two massless strings of equal length l is connected to a vertical rotating rod. The strings are tied to rod with a separation l. For what angular speed `omega` off the rod, lower string just becomes taut?

A

`√(g/l)`

B

`sqrt(2g/l)`

C

`sqrt(3g/l)`

D

`sqrt(3g/2l)`

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