The lower end of a 4 m long uniform rod ...

The lower end of a 4 m long uniform rod AB is pulled with constant speed v=4 `m//s`. The speed of centre of mass of the rod at `theta=60^(@)` will be

`(4)/(sqrt3) m//s`

`2sqrt3 m//s`

`4 m//s`

`4sqrt3 m//s`

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