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

Two blocks of msses 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

2 cm upward

B

1 cm upward

C

2cm downward

D

1 cm downward

Text Solution

Verified by Experts

The correct Answer is:
D
`y_(CM) = (m_(1)y_(1) + m_(2)y_(2))/(m_(1) + m_(2))`
or `+1= ((10)(7) + (30)y_(2))/(10 + 30)`
`therefore y_(2) = -1cm`
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