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

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