Five Boxes,each Having Weight 100 N,are Stacked Up

question 81

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 fourth box from the top on the third box from the top?

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

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