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Two blocks of masses 10 kg and 30 kg are...

Two blocks of 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?

A

1 cm up

B

1 cm down

C

2 cm down

D

2 cm up

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