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Height of a object

  1. Jul 22, 2009 #1
    I need help. I need to know how high an object goes if launched, travels up and back down, and lands 9 seconds later. I remember that in a vacuum, the travel time up equals the travel time down, but what is the equation?
  2. jcsd
  3. Jul 22, 2009 #2


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    The only thing you need to know, other than some basic algebra, is that the acceleration due to gravity is ~9.8 m/s2. Think about what that unit really means and it should be easy to solve.
  4. Jul 22, 2009 #3


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    Welcome to PF!

    Hi charles7! Welcome to PF! :wink:

    Use the standard constant acceleration equations. :smile:
  5. Jul 22, 2009 #4
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