Two particles of masses 1kg and 2kg are located at `x=0` and `x=3m`. Find the position of their centre of mass.

Explanation

To find the position of the center of mass of two particles with given masses and positions, we can follow these steps:

### Step 1: Identify the masses and their positions
- Let the mass \( m_A = 1 \, \text{kg} \) be located at position \( x_A = 0 \, \text{m} \).
- Let the mass \( m_B = 2 \, \text{kg} \) be located at position \( x_B = 3 \, \text{m} \).

### Step 2: Use the formula for the center of mass
The formula for the center of mass \( x_{cm} \) for two particles is given by:
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