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Joe, body mass of 60 kg, is gliding at 21 m/s north on his bicycle. The coefficient of rolling friction = 0.1 . The coefficient

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Joe, body mass of 60 kg, is gliding at 21 m/s north on his bicycle. The coefficient of rolling friction = 0.1 . The coefficient of static friction = 0.12. Air resistance is 75 N acting backward (south) on Joe. Friction and air resistance are the only horizontal forces acting on Joe. What is his horizontal acceleration? (please report answer to 1 decimal place)

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