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: Quick kinematics question

  1. Mar 4, 2013 #1
    A stone is dropped from the top of a building. Within the second before it hits the ground, it travels 1/5 of the building's height. Calculate the total height of the building.

    Been trying to formulate simultaneous equations but there just doesn't seem to be enough information and too many unknowns >< Help appreciated!
  2. jcsd
  3. Mar 4, 2013 #2
    What is the speed of the stone just before it hits the ground? You only need one equation.
  4. Mar 4, 2013 #3

    Doc Al

    User Avatar

    Staff: Mentor

    Show what you've done so far. How would you write the distance fallen as a function of time?
  5. Mar 4, 2013 #4
    You don't need more info either as the unknowns will eventually cancel out. There are actually a couple of different ways to solve this.
    Last edited: Mar 4, 2013
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted