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Need help on this problem please I cant figure it out

  1. Oct 12, 2004 #1
    Need help on this problem please!! I cant figure it out!!

    The problem is A 54.0 kg. skateboarder starts out with a speed of 1.90 m/s. He does +80.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -265 J of work on him. In both cases, the forces doing the work are nonconservative. The final speed of the skateboarder is 5.90 m/s.
    (a) Calculate the change (PE = PEf - PE0) in the gravitational potential energy?
    (b) How much has the vertical height of the skater changed?
    (c) Is the skater above or below the starting point?
    above the starting point or
    below the starting point ?
  2. jcsd
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