Two blocks of masses \( 10 \mathrm{~kg} \) and \( 30 \mathrm{~kg} \) are placed on the same stra...

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Two blocks of masses \( 10 \mathrm{~kg} \) and \( 30 \mathrm{~kg} \) are placed on the same straight line with coordinates \( (0,0) \) and \( (x, 0) \) respectively. The block of \( 10 \mathrm{~kg} \) is moved on the same line through a distance of \( 6 \mathrm{~cm} \) towards the other block. The distance through which the block of \( 30 \mathrm{~kg} \) must be moved to keep the position of centre of mass of the system unchanged is
- (a) \( 4 \mathrm{~cm} \) towards the \( 10 \mathrm{~kg} \) block
(b) \( 2 \mathrm{~cm} \) away from the \( 10 \mathrm{~kg} \) block
(c) \( 2 \mathrm{~cm} \) towards the \( 10 \mathrm{~kg} \) block
- (d) \( 4 \mathrm{~cm} \) away from the \( 10 \mathrm{~kg} \) block
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