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Homework Help: Calculus based physics problem. (energy and fricition)

  1. Oct 5, 2008 #1
    In the figure, a 3.8 kg block slides along a track from one level to a higher level after passing through an intermediate valley (frictionless). The track is frictionless until the block reaches the higher level. There a frictional force stops the block in a distance d. The block's initial speed is v0 = 6.9 m/s, the height difference is h = 1.2 m, and μk = 0.649. Find d.

    i've already found that energy transferred to thermal energy is 45.771 J, the normal force = 37.24 and the KE frictional force = 24.168 J but i'm not sure what to do with these numbers.
  2. jcsd
  3. Oct 5, 2008 #2
    I think you use W = fd. But, I'm not sure how.
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