Four particles of masses $m, 2m, 3m, 4m$ are placed at the corners of a square of side $a$ as shown in the figure. Find the coordinates of the center of mass.
- A$\left( \frac{a}{2}, a \right)$
- B$\left( \frac{a}{3}, \frac{3}{10}a^2 \right)$
- C$\left( \frac{2a}{4}, \frac{7}{5}a \right)$
- D$\left( \frac{a}{2}, \frac{7}{10}a \right)$
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