Two blocks ot masses 10 kg and 30 kg are placed along a vertical line. The first block is raised through a height of 7 cm. By what distance should the second mass be moved to raise the centre of mass by 1 cm?

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2 cm upward

1 cm upward

2 cm downward

1 cm downward

answer is D.

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Detailed Solution

yCM=m1y1+m2y2m1+m2 or +1=(10)(7)+(30)y210+30∴ y2=-1 cm

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