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Homework Help: Dropping a rock on mars

  1. Oct 5, 2008 #1
    1. The problem statement, all variables and given/known data

    An astronaut on Mars drops a rock straight downward from a height of 0.90 m. If the acceleration of gravity on Mars is 3.73 m/s2, what is the speed of the rock when it lands?
    find m/s

    3. The attempt at a solution

    .90m/3.73m/s2=.2413
    squareroot .2413=.491

    .90m+1/2(3.73m/s2)(.491)
    =1.816m/s
    it was wrong what equation am i suppose to use?
     
  2. jcsd
  3. Oct 5, 2008 #2
    There is an easier equation that you can use : Vf^2 = Vo^2 + 2ad.

    Also, just a suggestion, it's a lot easier to help you when you put units on your answers.
     
  4. Oct 5, 2008 #3
    ill remember that
     
  5. Oct 5, 2008 #4
    I got the right answer I think I am just having a hard time with what equations I have to use.
     
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