1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Freefall problem with object shot up off a building.

  1. Sep 15, 2004 #1
    A rock is shot vertically up froma building and starts falling back to Earth after 1.60 seconds. After 6.00 seconds, it hits the ground. Constant acelleration of 9.81 m / s^2.

    a. What is initial velocity?

    b. What is max height above building?

    c. How tall is the building?

    I got the following answer, I am unsure of them though:

    a => 15.7 m / s
    b => 12.6 m
    c => 164 m

    Could anyone tell me if my figures are correct?
    Thank you.
  2. jcsd
  3. Sep 16, 2004 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    a & b look good. c not so. Please show me your work.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Freefall problem object Date
Freefall problem of a diver jumping horizontally upward Dec 1, 2015
Freefall body problem Aug 19, 2015
Freefall body problem Aug 18, 2015
Object Freefall problem Jun 19, 2009
Help! Freefalling object problem! Aug 29, 2008