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Q.

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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a

2 cm upward

b

1 cm upward

c

2 cm downward

d

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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