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Velocity vectors of three masses 2kg,1kg...

Velocity vectors of three masses 2kg,1kg and 3 kg are `vecv_1 = (hati-2hatj+hatk) m/s,vecV_2 = (2hati +2hatj -hatk) m/s` and `vecv_3` respectively. If velocity vector of center of mass of the system is zero then value of `vecv_3` will be

A

`((2hati+2hatj-hatk)/3 ) m/s`

B

`((-4hati+2hatj-hatk)/3 ) m/s`

C

`((2hati+3hatj-hatk)/3 ) m/s`

D

`((-2hati+3hatj-hatk)/3 ) m/s`

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