A 60.7-kg skateboarder starts out with a speed of 1.6m/s. He does 85.2J of work on himself by pushing with his feet against the ground. In addition friction does -265J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the skateboarder is 6.82m/s. a)Calculate the change (PEf - PE0) in the gravitational potential energy. b)How much has the vertical height of the skater changed? Give absolute value.

\"u...\" F...\" ,,.4 v .....4_'....v...._..,,, _ "my..- u ..a,. ( HW7 PHYSZOO1 Question 4 of 9 View Policies Current Attempt in Progress A 60.7-kg skateboarder starts out with a speed of 1.60 m/s. He does 85.2 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 nal speed of the skateboarder is 6.82 m/s. (3) Caiculate the change (PE, - Hg) in the gravitational potential energy. (:1) How much has the vertical height of the skater changed? Give the absolute value. (a) Number l Units V (b) Number n Units v eTextbook and Media Save for Later Attempts: unlimited