A boy of mass 60 kg is sledding down a 70-m slope starting from rest. The slope is angled at 15° below the horizontal. After going 20 m along the slope he passes his friend, who jumps on the sled. The friend has a mass of 50 kg and the coefficient of kinetic friction between the sled and the snow is 0.12. Ignoring the mass of the sled, find their speed at the bottom.
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