Two blocks of mass $2 \, kg$ and $4 \, kg$ are accelerated with the same acceleration by a force of $10 \, N$ as shown in the figure on a smooth horizontal surface. Then the spring force between the two blocks will be .......... $N$ (the spring is massless).
- A$5$
- B$10$
- C$\frac{10}{3}$
- D$\frac{5}{3}$
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