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Homework Help: Frictionless ramp question. Find angle.

  1. Jun 21, 2010 #1
    1. The problem statement, all variables and given/known data
    A 55kg block is released on a ramp which is frictionless. The ramp is 20 meters long and at the bottom it is moving 8m/s. What is the angle of the ramp?


    2. Relevant equations
    I am looking for the angle but cannot for the life of me figure it out.


    3. The attempt at a solution

    I have set out my variables as m=55kg, d=20m and v=8m/s

    I drew out a triangle and have no idea how to do it.
     
  2. jcsd
  3. Jun 21, 2010 #2

    berkeman

    User Avatar

    Staff: Mentor

    Welcome to the PF. I moved your question to Intro Physics.

    Are you familiar with using the Total Energy to solve this type of question? Does this equation look familiar?

    TE = PE + KE
     
  4. Jun 21, 2010 #3
    Only force on the mass is gravity, which is conservative. so Einitial = Efinal

    Ui + Ki = Uf + Kf
     
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