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

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

`5 hati+2hatj-8hatk`

`7 hati+2hatj-8hatk`

`7 hati-2hatj +8hatk`

`5 hati-2hatj+8hatk`

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Two bodies of 6 kg and 4 kg masses have their velocity 5hati-2hatj+10hatk and 10hati-2hatj+5hatk , respectively. Then, the velocity of their centre of mass is

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Two bodies of mass 1 kg and 3kg have position vectors hati+2hatj+hatkand-3hati-2hatj+hatk , respectively. The centre of mass of this system has a position vecotor :-

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