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a child sleds down a 7.5m tall hill. the combined mass of the child and sled...

a child sleds down a 7.5m tall hill. the combined mass of the child and sled is 55.0kg. while sliding down the hill they encounter a 5.5m long rough patch of snow that exerts a friction force of 100N. if they had a speed of 1.4m/s at the top of the hill, what is their speed at the bottom of the hill? please be descriptive!!!

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