Two bodies of 6kg and 4kg masses have th...

Two bodies of `6kg` and `4kg` masses have their velocity `5hati - 2 hat j + 10 hat k` and `10hat i - 2 hat j + 5 hat k` respectively. Then, the velocity of their centre of mass is

`5hati+2hatj-8hatk`

`7hati+2hatj-8hatk`

`7hati-2hatj+8hatk`

`5hati-2hatj+8hatk`

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