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: Lost on Projectile motion problem

  1. Sep 27, 2010 #1
    1. The problem statement, all variables and given/known data

    A marble is thrown horizontally with a speed of 12.0 m/s from the top of a building. When it strikes the ground, the marble has a velocity that makes an angle of 30.3 ° with the horizontal. From what height above the ground was the marble thrown?

    -im lost at where to begin

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Sep 27, 2010 #2
    I think the key in this question is whether or not you are ignoring air resistance?

  4. Sep 27, 2010 #3
    yes, while ignoring the air resistance
  5. Sep 27, 2010 #4
    If there is no air resistance, there is nothing acting to decelerate the ball in the horizontal plane. The balls horizontal velocity is a constant 12m/s.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook