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!

Projectile motion- Deriving the right formular

  1. Jan 24, 2010 #1
    1. The problem statement, all variables and given/known data

    Projectile A is launched horizontally at a
    speed of 20. meters per second from the top of
    a cliff and strikes a level surface below, 3.0 seconds
    later. Projectile B is launched horizontally
    from the same location at a speed of 30. meters
    per second.
    Approximately how high is the cliff?
    (1) 29 m (3) 60. m
    (2) 44 m (4) 104 m
    2. Relevant equations


    d=tv
    3. The attempt at a solution
    On two occasions my answer turn out to be '3' and '4'. but the answer key says it's '2'. I have tried for hours but i cant find the right approach. Please offer me a good explanation of how I should work with this? or u can even give me a link to read more or something.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jan 24, 2010 #2

    rl.bhat

    User Avatar
    Homework Helper

    Use the equation
    h = 1/2*g*t^2
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Projectile motion- Deriving the right formular
Loading...