The small 0.1-kg slider enters the loop-the-loop with a speed v A = 12 m /s as

Question:

The small 0.1-kg slider enters the “loop-the-loop” with a speed v_A = 12 m /s as it passes point A, and it has a speed v_B = 10 m /s as it exits at point B. Determine the work done by friction between points A and B. The track lies in a vertical plane. Assume that contact is maintained throughout.

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