A 54.7-kg skateboarder starts out with a speed of 1.64 m/s. He does 89.7 J of work on himself by pushing with his feet against the ground. In addition, friction does -284 J of work on him. In both cases, the forces doing
A 54.7-kg skateboarder starts out with a speed of 1.64 m/s. He does 89.7 J of work on himself by pushing with his feet against the ground. In addition, friction does -284 J of work on him. In both cases, the forces doing
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Transcribed Image Text:A 54.7-kg skateboarder starts out with a
speed of 1.64 m/s. He does 89.7 J of work on
himself by pushing with his feet against the
ground. In addition, friction does -284 J of
work on him. In both cases, the forces doing
the work are non-conservative. The final
speed of the skateboarder is 8.40 m/s. (a)
Calculate the change (PEF - PEo) in the
gravitational potential energy. (b) How much
has the vertical height of the skater changed?
Give the absolute value.
(a) Number i 89.7
(b) Number
-3.9
Units
Units
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