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So I'm mainly confused about part b. I know how to get the answer, but I'm confused about why I include the distance traveled up the ramp as well as down the ramp when finding the work done by friction. If I set the starting position at to be the top of the ramp to solve the problem, the block only travels a distance of 1.6 meters not 1.6*2 meters so why do I include the entire path traveled? Also wouldn't work done by friction be zero if you do include the entire distance traveled because Work = Force * displacement and since the stating position is the same as the ending position, the displacement is zero?