Matthew wants to push a 12.0 kg chair to his desk. The coefficient of kinetic friction is 0.45. a. If Matthew pushes the chair with a force of 120 N, determine the acceleration of the chair? b. As Matthew continues to push the chair with a 120 N force, his classmate Luke applies a 45 N force in the opposite direction. What is the acceleration of the chair now? c. Instead, Luke decides to apply a 45 N force downwards. Determine the acceleration of the chair. (Hint: be sure to determine FN first)

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