A skier is on a mountain whose slope is 20 °. The coefficient of kinetic friction is 0.22. At a certain instant, he has a speed of 8.9 m / s and from that moment he travels 120 m, what is the speed at the end of that journey? a) 19.90 m/s b) 29.12 m/s c) 46.19 m/s d) 23.81 m/s
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