1.
Two bodies of mass 1 kg1\,\text{kg} and 3 kg3\,\text{kg} have position vectors i^+2j^+k^\hat{i} + 2\hat{j} + \hat{k} and −3i^−2j^+k^-3\hat{i} - 2\hat{j} + \hat{k}, respectively. The centre of mass of this system has a position vector