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!

Homework Help: Vertical launch, projectile Q

  1. Oct 10, 2007 #1
    First, let us consider an object launched vertically upward with an initial speed v. Neglect air resistance. What is the speed of the object at the height of (1/2)h max? i know that h max = (initial v in the y direction / 2g) and i also know that Kinitial +Uinitial =Kfinal +Ufinal or 0.5(mv^2) = 0.25(mv^2) + mg(.5 h max)

    please help! you will be blessed, i swear... :)
  2. jcsd
  3. Oct 10, 2007 #2


    User Avatar
    Homework Helper

    your formula is wrong.

    hmax = (vinitial^2)/(2g)

    now use the equation:

    vf^2 = vi^2 + 2ad

    use d = (1/2)hmax. use a = -g. use vi = vinitial... and that's it. solve for vf.
  4. Oct 10, 2007 #3
    ok i got it. thanks^^
    Last edited: Oct 10, 2007
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook