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5. Blocks A, B, and C (next page) have masses of 8 kg, 12 kg, and 80 kg, respectively. The coefficient of static friction

5. Blocks A, B, and C (next page) have masses of 8 kg, 12 kg, and 80 kg, respectively. The coefficient of static friction between all contacting surfaces is s = 0.4. What is the required force, F, to cause C to start moving upward? C 10

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