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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

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    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
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