Two particles whose masses are 10 kg and...

Two particles whose masses are 10 kg and 30 kg and their position vectors are `hati+hatj+hatk and -hati-hatj-hatk` respectively would have the centre of mass at position :-

`-((hati+hatj+hatk)/2)`

`((hati+hatj+hatk)/2)`

`-((hati+hatj+hatk)/4)`

`((hati+hatj+hatk)/4)`

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