Kieran Takes Off Down a 50 M High,10° Slope on His

question 1

Multiple Choice

Kieran takes off down a 50 m high,10° slope on his jet-powered skis.The skis have a thrust of 280 N.The combined mass of skis and Kieran is 50kg (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