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Homework Help: Collission of Skateboarders

  1. Oct 7, 2014 #1
    1. The problem statement, all variables and given/known data
    Dan and Tom are skateboarding in a large semicircular halfpipe. Dan starts out from rest at a height h and collides with Tom standing at the bottom. Dan and Tom have about the same mass. After the collision, which height will Tom reach? Let's neglect friction and consider the following two extreme cases:
    a) The collision is totally inelastic.
    b) The collision is elastic.

    2. Relevant equations

    H = v² / 2g

    3. The attempt at a solution
    For part a) = V²/4 / 2g leaves them at h/4
    For part b) = v^2/4/2g leaves them at h/4

    Part a is correct but part b isn't. Any help would be appreciated
  2. jcsd
  3. Oct 7, 2014 #2


    User Avatar

    Staff: Mentor

    You need to show how you arrived at your answers. How can we help if we can't see where you went wrong?
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