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An older sister begins to pull her little brother on a sled as shown with a force of 25N along her arm. Kinetic friction between

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An older sister begins to pull her little brother on a sled as shown with a force of 25N along her arm. Kinetic friction between the sled's skis and the snow is 11 N. Calculate the acceleration of the sled if its mass plus the child is 18 kg, assuming the sled is already in motion

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