1. Not finding help here? Sign up for a free 30min 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!

Calculating velocities with only acceleration and time

  1. Sep 10, 2009 #1
    This was a basic physics experiment. A ball was thrown upward and then caught. Calculate initial and final velocity given: acceleration= -9.8m/s^2 (gravity); time= 2.12sec



    delta x=Vi*t+(.5)(t)^2
    Vf=Vi+at




    I actually don't know where to begin. I don't know an equation for velocity that doesn't require displacement (which I also need to find).
     
  2. jcsd
  3. Sep 10, 2009 #2

    drizzle

    User Avatar
    Gold Member

    if it's caught at the same horizontal level, then vi=vf [note the direction of each, one is + and the other is -]

    solve!


    ps. welcome to PF :)
     
  4. Sep 10, 2009 #3
    Thanks for the help. So how would I figure out which equation to use?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook