A skeir of mass 115 kg travels down a ski trail. Suppose the ski trail is not frictionless.  a) if the top of the trail is a height of 180 m above the bottom, find the work done by gravity.  firgured out answer is 202860 J.  b) if the skier has a speed of 36 m/s at the bottom of the hill, what is the work done by friction on the skier? (assume the skier starts at the top of the hill).

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