Two blocks of masses \( 10 \mathrm{~kg} \) and \( 30 \mathrm{~kg} \) are placed P along a vertic...

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Two blocks of masses \( 10 \mathrm{~kg} \) and \( 30 \mathrm{~kg} \) are placed
P along a vertical line if the first blocks is raised

W through a height of \( 7 \mathrm{~cm} \) then the distance through the second mass should be moved to raise the centre of mass of the system by \( 1 \mathrm{~cm} \) is
(1) \( 1 \mathrm{~cm} \) up
(2) \( 1 \mathrm{~cm} \) down
(3) \( 2 \mathrm{~cm} \) down
(4) \( 2 \mathrm{~cm} \) up
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