Two blocks of masses `10kg` and `30kg` are placed on X-axis. The first mass is moved on the axis by a distance of `2cm` right. By what distance should the second mass be moved to keep the position of centre of mass unchanged.

Explanation

To solve the problem, we need to find out how far the second mass (30 kg) should be moved to keep the center of mass of the system unchanged after the first mass (10 kg) is moved 2 cm to the right.

### Step-by-Step Solution:

1. **Identify the masses and their displacements:**
- Let \( m_1 = 10 \, \text{kg} \) (first mass)
- Let \( m_2 = 30 \, \text{kg} \) (second mass)
- The first mass is moved \( d_1 = 2 \, \text{cm} \) to the right.
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