Kieran Takes Off from Rest Down a 50 M High,10°

question 72

Multiple Choice

Kieran takes off from rest down a 50 m high,10° slope on his jet-powered skis.The skis have a thrust of 280 N parallel to the surface of the slope.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?

• A) 0.47
• B) 0.58
• C) 0.23
• D) 0.29

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