Two particles of masses in the ratio $1:2$ are placed along a vertical line. The lighter particle is raised through a height of $9 \ cm$. To raise the centre of mass of the system by $2 \ cm$,the heavier particle should be

  • A
    moved $1.5 \ cm$ downward
  • B
    moved $2 \ cm$ upward
  • C
    moved $1.5 \ cm$ upward
  • D
    moved $2 \ cm$ downward

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