1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: What is wrong with my math here? [Kinematics]

  1. Mar 25, 2016 #1
    1. The problem statement, all variables and given/known data

    Open image in new tab to enlarge please :)

    2. Relevant equations
    I was trying to compare the initial KE/PE with the final KE/PE in order to find out how far the skateboarder rose but the solution was wrong for some reason?

    Keep in mind the skateboarder is travelling along the HORIZONTAL portion of the ramp at 6.5m/s so when he gets to the top of the ramp he will only be travelling at 5.77m/s by my calculations.

    3. The attempt at a solution
  2. jcsd
  3. Mar 25, 2016 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Somehow, the skateboarder's initial horizontal velocity morphed from 6.5 m/s to 6.8 m/s in your calculations of KE/PE. Bad handwriting, perhaps? :frown:
  4. Mar 25, 2016 #3

    WOW, thanks so much. I was killing myself over this question and probably spent ~3 hours trying to rack my brain around it even though it's basic physics.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted