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Joe, body mass of 85 kg, is gliding at 20 m/s north on his bicycle. The coefficient of dynamic friction = 0.12. The coefficient

Joe, body mass of 85 kg, is gliding at 20 m/s north on his bicycle. The coefficient of dynamic friction = 0.12. The coefficient of static friction = 0.15. Air resistance is 25 N acting backward (south) on Joe. Friction and air resistance are the only horizontal forces acting on Joe. What is the direction of his horizontal acceleration?

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