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!

Finding final velocity

  1. Feb 14, 2014 #1
    1. The problem statement, all variables and given/known data
    A marble is released from a 10cm ramp. Its final velocity is 1.4 m/s. If it is released from a 20cm ramp, twice the height, what will its final velocity be?



    2. Relevant equations
    E = mgy + mv^2/2
    mgy = mv^2/2 (Like initial gravitational potential energy will equal final kinetic energy? Does that make sense?)



    3. The attempt at a solution
    I tried to use mgy = mv^2/2, where I get 2gy = v^2. For g, our physics teacher has us use 10 m/s^2, and if the height is 20cm, then (2*.2m*10m/s^2) = v^2, 400 = v^2, v = 2m/s, but I don't think that is right.

    I asked my teacher for help, and he said to think about the relationship between the height and the velocity (which I think has to do with square roots, but other than that, I am lost).
     
    Last edited: Feb 14, 2014
  2. jcsd
  3. Feb 14, 2014 #2
    Never mind, I figured it out! :)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Finding final velocity
  1. Finding final velocity (Replies: 2)

Loading...