PLEASE, read bottom. A 51.3-kg skateboarder starts out with a speed of 1.85 m/s.

Question

PLEASE, read bottom.

A 51.3-kg skateboarder starts out with a speed of 1.85 m/s. He does 101 J of work on himself by pushing with his feet against the ground. In addition, friction does -262 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the skateboarder is 9.03 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.

For the first answer I got "-2164.727J" which is CORRECT.
For the second answer I got "-4.306m" which is INCORRECT.

I do not under stand what I am doing wrong.

Explanation / Answer

a) -101-262 +x + 2003.7 = 0 change in GPE = -1640.73 J b) change in verticcal hieght ( hf - hi ) = - 3.26 m

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