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What is wrong with my math here? [Kinematics]

  1. Mar 25, 2016 #1
    1. The problem statement, all variables and given/known data
    Kp0dD6b.png

    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
    BIMNQfo.jpg
     
  2. jcsd
  3. Mar 25, 2016 #2

    SteamKing

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    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.
     
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