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Homework Help: Free fall without a lot of info.

  1. Nov 7, 2011 #1
    1. The problem statement, all variables and given/known data

    A ball is thrown horizontally at 16m/s from a clifftop 65m above the sea level.

    the time to land

    2. Relevant equations

    distance = Vi*t + at^2/2

    3. The attempt at a solution

    I separated x and y components. And tried to plug them in this formula. I thought maybe I will have 2 unknowns and will then resolve it by plugging the equation in the other. But I realized I had 3 unknowns since they don't give me the angle. So, I can't find the components of the initial speed.

    Maybe, I am using the wrong formula ?

    Thanks in advance !
  2. jcsd
  3. Nov 7, 2011 #2


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    Staff: Mentor

    "A ball is thrown horizontally..." What's the launch angle for a horizontally thrown projectile?
  4. Nov 7, 2011 #3
    Oh wow. My problem is that, I've been in french school since I am a kid. Now that I am in an English college for the first time, all the terms and words are different. Thanks !
  5. Nov 7, 2011 #4


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    Staff: Mentor

    "It's like those French have a different word for everything!" -- Steve Martin :smile:
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