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!

Physics, help find time.

  1. Dec 11, 2011 #1
    1. The problem statement, all variables and given/known data

    http://i1120.photobucket.com/albums/l498/LaLadude/2.jpg

    How long does it take to reach the ground? And what is the angle of impact with the ground?

    2. Relevant equations



    3. The attempt at a solution
    Δy = Voy * t + (1/2)ay * t2
    t = (-5 m/s) ± √(5 m/s)2 - 4(1/2)(-9.81 m/s2)(-100m) / 2(1/2)(-9.81 m/s2)

    t = -5 m/s ± (4.54)

    Is it suppose to be 4.54 or -4.54? And am I suppose to add or subtract the two variables to find t??
     
    Last edited: Dec 11, 2011
  2. jcsd
  3. Dec 11, 2011 #2
    Post the entire question.
     
  4. Dec 11, 2011 #3
    I added a picture link if it'll help.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook