A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -278 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the skateboarder is 8.12 m/s. (a) Calculate the change (PEf - PE0) in the gravitational potential energy. (b) How much has the vertical height of the skater changed? Give the absolute value.
I have calculated the PE and found it to be -2088.69J. However, I am stuck on trying to solve part b. Please help!
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http://www.jiskha.com/display.cgi?id=1429748458
well we agree on part a and part b is easy
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