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: Velocity Of The Ice As It Hits The Ground?

  1. Jan 21, 2008 #1
    The John Hancock Center In Chicago Is The Tallest Building In The United States In Which There Are Residential Apartments. The Hancock Center Is 343m Tall. Suppose A Resident Accidentally Causes A Chunk Of Ice To Fall From The Roof. What Would Be The Velocity Of The Ice As It Hits The Ground? Neglect The Air Resistance
    Last edited by a moderator: May 9, 2015
  2. jcsd
  3. Jan 21, 2008 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Seem pretty stright forward, what is your question?
  4. Jan 21, 2008 #3


    User Avatar
    Homework Helper

    1) What did you try?
    2) See above
    3) Think energy
  5. Jan 21, 2008 #4
    Ok I Tried

    A= -9.8 M/s

    Looking For Vf=

    Vf^2=0^2+2 X -9.8 X 343

    And Then I Solved It From There
  6. Jan 21, 2008 #5
    Looks like.
  7. Jan 22, 2008 #6
    s=343 u=0 a=9.8



    v=82 m/s

    the mistake you've made is putting gravity as -9.8 when it is actually 9.8 as the object is accelerating towards the earth.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook