Two bodies of mass 1 kg and 3 kg have position vectors $\widehat i + 2\widehat j + \widehat k$ and $ - 3\widehat i - 2\widehat j + \widehat k$, respectively. The center of mass of this system has a position vector :
$ - 2\widehat i - \widehat j + \widehat k$
$2\widehat i - \widehat j - 2\widehat k$
$ - \widehat i + \widehat j + \widehat k$
$ - 2\widehat i + 2\widehat k$
Solution
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