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You are riding in an elevator on the way to the eighteenthfloor of your dormitory. The elevator is accelerating upwardwith a = 1.90 m/s2. Beside you is the boxcontaining your new computer; box and contents have a total mass28.0 kg. While the elevator is accelerating upward, you pushhorizontally on the box to slide it at constant speed toward thedoor. If the coefficient of kinetic friction between the boxand elevator floor is mk = 0.32, what magnitudeof force must you apply?

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