Chapter 6, Problem 20P

GO In Fig. 6-27, a box of Cheerios (mass m_C = 1.0 kg) and a box of Wheaties (mass m_W = 3.0 kg) are accelerated across a horizontal surface by a horizontal force $\stackrel{\to }{F}$ applied to the Cheerios box. The magnitude of the frictional force on the Cheerios box is 2.0 N, and the magnitude of the frictional force on the Wheaties box is 4.0 N. If the magnitude of $\stackrel{\to }{F}$ is 12 N, what is the magnitude of the force on the Wheaties box from the Cheerios box?

Figure 6-27 Problem 20.