Multiple-Object Accelerating Systems: A 3.0-kg and a 5.0-kg box rest side-by-side on a perfectly smooth, level floor. A horizontal force of 32 N is applied to the 3.0-kg box pushing it against the 5.0-kg box, and, as a result, both boxes slide along the floor. How hard do the two boxes push against each other?
A. 12 N
B. 20 N
C. 24 N
D. 32 N
E. 0 N
Answer: B
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