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10 problems. P1: 'A 10kg box on a surface with μ_s=0.5, μ_k=0.3. Maximum static friction = ___ N' (50). P2: 'Kinetic friction on same box = ___ N' (30). P3: 'Minimum force to start the box moving = ___ N' (50). P4: 'Once moving, what force keeps it at constant velocity? ___ N' (30). P5: 'A 20kg box

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