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Two objects of masses m and 3m are locat...

Two objects of masses m and 3m are located at `(hati + 2hatj + hatk)` and `(-hati-2hatj+hatk)` resp. Find position vector of COM of two objects is

A

a. .`2hati+2hatj-hatk`

B

b. `hati+hatj-hatk`

C

c. `-2hati-hatj-hatk`

D

d. `hati+2hatj-2hatk`

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