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

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

A

`-2hati + 2hatk`

B

`-2hati - hatj + hatk`

C

`2hati - hatj - hatk`

D

`-hati + hatj + hatk`

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