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Two bodies of mass 1kg and 3kg have posi...

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

A

`-2hati-hatj+hatk`

B

`2hati-hatj-2hatk`

C

`-hati+hatj+hatk`

D

`-2hati+2hatk`

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