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Homework Help: Acceleration of gravity

  1. Aug 19, 2010 #1
    1. The problem statement, all variables and given/known data
    A model rocket leaves the ground , heading straight up at 49 m/s
    a) what is its maximum altitude?
    b) what are its speed and altitude at 1,4 & 7 seconds

    2. Relevant equations
    v=v0 + at
    x= x0 + 1/2 (v0 + v) t
    x= x0 + v0t + 1/2 at^2
    v^2=v0^2 +2a (x-x0)

    3. The attempt at a solution
    Am able to work out maximum altitude no problem , for some reason cant get my head around b) ?
  2. jcsd
  3. Aug 19, 2010 #2


    User Avatar
    Homework Helper

    Use the formula
    x = xo + vot - 1/2*g*t^2 and find x at given time t.
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