Two objects of masses $200 \text{ g}$ and $500 \text{ g}$ possess velocities $10 \hat{i} \text{ m/s}$ and $(3 \hat{i} + 5 \hat{j}) \text{ m/s}$ respectively. The velocity of their centre of mass in $\text{m/s}$ is:

  • A
    $5 \hat{i} - 25 \hat{j}$
  • B
    $\frac{5}{7} \hat{i} - 25 \hat{j}$
  • C
    $5 \hat{i} + \frac{25}{7} \hat{j}$
  • D
    $25 \hat{j} - \frac{5}{7} \hat{j}$

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