Posted by **s** on Monday, November 21, 2011 at 6:29pm.

A 54.5 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 (ΔPE = PEf - PE0) in the gravitational potential energy.

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