A body of mass $3 \mathrm{kg}$ moving with a velocity $\left(2\hat{\mathrm{i}}+3\hat{\mathrm{j}}+3\hat{\mathrm{k}}\right) \mathrm{m} {\mathrm{s}}^{-1}$collides with another body of mass $4 \mathrm{kg}$ moving with a velocity $\left(3\hat{\mathrm{i}}+2\hat{\mathrm{j}}-3\hat{\mathrm{k}}\right) \mathrm{m} {\mathrm{s}}^{-1}$. The two bodies stick together after collision. The velocity of the composite body is