(adsbygoogle = window.adsbygoogle || []).push({}); Need help on this problem please!! I cant figure it out!!

The problem is A 54.0 kg. skateboarder starts out with a speed of 1.90 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 5.90 m/s.

(a) Calculate the change (PE = PEf - PE0) in the gravitational potential energy?

J

(b) How much has the vertical height of the skater changed?

m

(c) Is the skater above or below the starting point?

above the starting point or

below the starting point ?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Need help on this problem please I cant figure it out

Can you offer guidance or do you also need help?

Draft saved
Draft deleted

**Physics Forums | Science Articles, Homework Help, Discussion**