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Homework Help: Air drag and acceleration (not gravity)

  1. Nov 27, 2009 #1
    In physics class we made a rocket and test fired it. Now we are given the thrust and we found out the max height of the rocket and the time of flight.

    Max Height = 76m
    Time of thrust/ upward acceleration = .8s
    Time of flight with only gravity acting until velocity is 0 . = 4.96s (not including downward fall)
    Mass of rocket = 0.08 kg
    Fg= 0.8N
    g= 9.8m/s^2

    Now we are supposed to find the air drag acting on the object. But I have no clue on how to do that because all the formulas relate to velocity, which is not really a given because the rocket is accelerating upwards. So is there a formula that I can use to solve this?
  2. jcsd
  3. Nov 27, 2009 #2


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    Gold Member

    The rocket is not accelerating upwards during this phase:

  4. Nov 27, 2009 #3
    4.96 seconds is the time it took for velocity to be 0, ... reach maximum height
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