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A55.6-kg skateboarder starts out with a speed of 2.44 m/s. he does 80.4 j of work on himself by pushing with his feet against the ground. in addition, friction does -244 j of work on him. in both cases, the forces doing the work are non-conservative. the final speed of the skateboarder is 7.24 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.
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A55.6-kg skateboarder starts out with a speed of 2.44 m/s. he does 80.4 j of work on himself by push...
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