Three point masses of `1 kg, 2kg and 3 kg` lie at `(1,2), (0,-1) and (2, -3)` respectively. Calculate the co-ordinates of the centre of mass of the system.

Explanation

To find the coordinates of the center of mass of the system consisting of three point masses, we can follow these steps:

### Step 1: Identify the masses and their coordinates
We have three point masses:
- Mass \( m_1 = 1 \, \text{kg} \) at coordinates \( (x_1, y_1) = (1, 2) \)
- Mass \( m_2 = 2 \, \text{kg} \) at coordinates \( (x_2, y_2) = (0, -1) \)
- Mass \( m_3 = 3 \, \text{kg} \) at coordinates \( (x_3, y_3) = (2, -3) \)

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