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: Help with Projectile Motion

  1. Sep 16, 2004 #1
    Hi, can someone please tell me how to figure out the initial (horizontal) velocity of a ball that rolls horizontally off a cliff at a height of 1.5 m from the ground, and lands 3 m away from the edge of the cliff?
    Last edited: Sep 16, 2004
  2. jcsd
  3. Sep 16, 2004 #2
    u_horizontal *t = 3
    1.5 = 0*t+(1/2)*g*t^2

    -- AI
  4. Sep 16, 2004 #3


    User Avatar
    Science Advisor
    Homework Helper

    How long does the ball take to reach the ground? How fast does it have to travel horizontally to be 3 m out in that time?
  5. Sep 16, 2004 #4

    The problem is....the question doesn't give the time or speed. :cry:
  6. Sep 16, 2004 #5


    User Avatar
    Homework Helper

    You can always combine equations.
  7. Sep 17, 2004 #6
    Yes, that worked. Thanks a bunch! :smile:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook