Three Boxes Rest Side-By-Side on a Smooth, Horizontal Floor

question 1

Multiple Choice

Three boxes rest side-by-side on a smooth, horizontal floor. Their masses are 5.0 kg, 3.0 kg, and 2.0 kg, with the 3.0-kg mass in the center. A force of 50 N pushes on the 5.0-kg mass, which pushes against the other two masses. What is the contact force between the 5.0-kg mass and the 3.0-kg mass?

• A) 0 N
• B) 10 N
• C) 25 N
• D) 40 N
• E) 50 N

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