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Two boxes of textbooks, of masses $10\text{ kg}$ and $15\text{ kg}$, are connected by a lightweight string, and then pulled across a horizontal table by a horizontal applied force, as shown in the diagram above.

The applied force has a magnitude of $50\text{ N}$, and there is no friction between the boxes and table. What is the acceleration of the $10\text{ kg}$ box?


$3.3\text{ m/s}^{2}$


$2.0\text{ m/s}^{2}$


$5.0\text{ m/s}^{2}$


The box will not accelerate because the tension force acting on it to the left must also be $50\text{ N}$.

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