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

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

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

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

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

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