Question

Four rods AB, BC, CD and DA have mass m, 2m, 3m and 4m respectively. The centre of mass of all the four rods

• A. Lie in region 1
• B. Lie in region 2
• C. Lie in region 3
• D. Lie at O

Answer 1

The correct option is A Lie in region 1

$C_1\to$ Position of centre of mass of rods AB and CD (nearer to CD, as it is heavy)

$C_2\to$ Position of centre of mass of rods BC and DA
$C\to$ Overall centre of mass of all four rods.