A 54.0-kg skateboarder starts out with a speed of 1.70 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 6.00 m/s. (a) Calculate the change (APE = PEf- PEO) in the gravitational potential energy. (b) How much has the vertical height of the skater changed? Is the skater above or below the starting point? O above the starting point O below the starting point Additional Materials eBook

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Chapter1: Units, Trigonometry. And Vectors
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A 54.0-kg skateboarder starts out with a speed of 1.70 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 6.00 m/s.
(a) Calculate the change (APE = PEf - PEo) in the gravitational potential energy.
(b) How much has the vertical height of the skater changed?
Is the skater above or below the starting point?
O above the starting point
O below the starting point
Additional Materials
eBook
abc
P Type here to search
hp
20
Transcribed Image Text:A 54.0-kg skateboarder starts out with a speed of 1.70 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 6.00 m/s. (a) Calculate the change (APE = PEf - PEo) in the gravitational potential energy. (b) How much has the vertical height of the skater changed? Is the skater above or below the starting point? O above the starting point O below the starting point Additional Materials eBook abc P Type here to search hp 20
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