A 30-Kg and a 5

Multiple Choice

A 3.0-kg and a 5.0-kg box rest side-by-side on a 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 large is the contact force between the two boxes?

A) 12 N
B) 20 N
C) 24 N
D) 32 N
E) 0 N