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Homework Help: Problem i need some help with

  1. Sep 18, 2007 #1
    1. The problem statement, all variables and given/known data


    A 200kg weather rocket is loaded with 100 kg of fuel and fired straight up. It accelerates upward at 35.0 m/s^2 for 34.0 s, then runs out of fuel. Ignore any air resistance effects.

    What is the rocket's maximum altitude?

    How long is the rocket in the air?


    2. Relevant equations

    Kinematics


    3. The attempt at a solution

    I know i need to break the rocket into 2 sections and deal with each seperatly but im not sure which equations to use and how to set them up?
     
  2. jcsd
  3. Sep 18, 2007 #2
    The mass is just extra data, you don't need to know it. Find how fast it is going after the fuels acceleration and then you can find out how high it goes and then you can add up the total time.
     
  4. Sep 18, 2007 #3
    I think I understand that but what equations will help me get closer to the solution in each case?
     
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