One of the new events in the 2002 Winter Olympics was the sport of skeleton (see

Question

One of the new events in the 2002 Winter Olympics was the sport of skeleton (see photo). Starting at the top of a steep, icy track, a rider jumps onto a sled (known as a skeleton) and proceeds-belly down and head first-to slide down the track. The track has fifteen turns and drops 102 m in elevation from top to bottom.

(a) In the absence of nonconservative forces, such as friction and air resistance, what would be the speed of a rider at the bottom of the track? Assume that the speed of the rider at the beginning of the run is relatively small and can be ignored.
m/s

(b) In reality, the best riders reach the bottom with a speed of 35.8 m/s (about 80 mi/h). How much work is done on an 84.8-kg rider and skeleton by nonconservative forces?


I've looked at the related questions and answers on cramster but Im still not getting the right answer for part (b). I believe the other solutions are incorrect. please help!
thanks

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Wnc=KEi-KEr=33198joules

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