Five Boxes, Each Having Weight 100 N, Are Stacked Up

question 75

Multiple Choice

Five boxes, each having weight 100 N, are stacked up. The bottom box is the fifth from the top. What is the magnitude of the normal force upward exerted by the third box from the top on the second box from the top?

• A) 100 N
• B) 200 N
• C) 300 N
• D) 400 N