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

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

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