Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Find the magnitude of the initial velocity.

  1. Sep 13, 2010 #1
    1. The problem statement, all variables and given/known data

    A ball thrown into the air lands on the same horizontal level, 38 m away, and 3 s later. Find the magnitude of the initial velocity.

    2. Relevant equations

    x = vox

    3. The attempt at a solution

    I just plugged the x distance which is 38m and the time which is 3s into the equation on top and got the wrong answer..
  2. jcsd
  3. Sep 13, 2010 #2
    That's because you only found the velocity in the x direction. Though I suppose that unless the problem specifically stated that there is a non-zero y velocity then you'd be right. You also have to find velocity in the y direction to get the total velocity. Then find the total magnitude.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook