Kieran takes off down a 50 m high 10deg slope on his, Ask an Expert

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Kieran takes off down a 50 m high, 10° slope on his jet-powered skis. The skis have a thrust of 320 N. The combined mass of skis and Kieran is 50 kg (the fuel mass is negligible). Kieran's speed at the bottom is 40 m/s. What is the coefficient of kinetic friction of his skis on snow?

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