Three particles of masses $20 \, g$,$30 \, g$,and $50 \, g$ have velocities $10 \, \hat{i}$,$10 \, \hat{j}$,and $10 \, \hat{k}$ respectively. The velocity of the center of mass of these three particles is:

  • A
    $2 \, \hat{i} + 3 \, \hat{j} + 5 \, \hat{k}$
  • B
    $10 \, (\hat{i} + \hat{j} + \hat{k})$
  • C
    $20 \, \hat{i} + 30 \, \hat{j} + 5 \, \hat{k}$
  • D
    $2 \, \hat{i} + 30 \, \hat{j} + 50 \, \hat{k}$

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