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Homework Help: Just tell me if this is even possible

  1. Sep 21, 2010 #1
    1. The problem statement, all variables and given/known data

    Let's say that my friend throws a tennis ball down a building.

    is it possible for me to find the time at which it hits the floor and at what speed it it is when it hits the floor. If he only tells me the initial speed and lenght of the building?

    2. The attempt at a solution

    (according to my thoughts, it seems impossible unless he tells me the time interval or the final speed, idk am i suppose to use the -9.8 acceleration for something?)
  2. jcsd
  3. Sep 21, 2010 #2


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    Gold Member

    yes, it is possible. You need the kinematic motion equations for constant acceleration. In this problem, once the ball leaves the thrower's hand, at an initial speed, the ball is now subject only to the force of gravity, thus, it's acceleration must be ____?____.
  4. Sep 21, 2010 #3
    9.8 m/s^2

    Thanks alot for the reply .
    Last edited: Sep 21, 2010
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