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Rei is pushing a 12-kg box across the horizontal floor of an elevator at a constant speed. The coefficient of kinetic friction between the box

Rei is pushing a 12-kg box across the horizontal floor of an elevator at a constant speed. The coefficient of kinetic friction between the box and floor is 0.36. What is the frictional force acting on the block when the elevator is a) stationary, b) accelerating upwards at a rate of 1.4 m/s2

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