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- [iii: 16kg]----[ii: 24kg]----[i: 20kg]-------->135N
- Friction force : Ff = 0.17(60kg * 9.81) = 100N
- acceleration: a = 135N - 100N / 60kg = 0.58m/s^2
- pair 1: (135N-100N)-(20kg*0.58m/s)=23.4N
- pair 2: (23.4)-(24kg*0.58m/s)=9.48N
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