Question 14 (3.5 points)
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Three boxes are lined up so that they are touching each other on a nearly frictionless plane. Box A has a mass of $m_A = 22.0 \, kg$, box B has a mass of $m_B = 30.5 \, kg$, and box C has a mass of $m_C = 53.0 \, kg$. An external force $\vec{F}$ pushes on box A toward the right, and the force that box B exerts on box C has a magnitude of 199 N. Ignore friction. What is the magnitude of the acceleration $a$ of the boxes?
3.75 $m/s^2$
3.50 $m/s^2$
4.25 $m/s^2$
3.25 $m/s^2$