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Erin is pushing her little sister at a constant velocity across the snow in a sled. The ground is level but the force of Erin's push is angled at $25^\circ$ below the horizontal. The combined mass of Erin's sister and the sled is $40\:kg$ and the coefficient of kinetic friction between the sled and the snow is $0.12$.

How much work does Erin do in pushing her sister a distance of $14\:m$?









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