1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Takeoff time of an aircraft

  1. Jul 3, 2009 #1
    1. The problem statement, all variables and given/known data
    An aircraft has a lift-off speed of 40m/s. How long does it take the aircraft to be airborn after a takeoff run of 320m?


    2. Relevant equations
    I know that I have to divide 320m by the speed (40m/s). But if I do that, I get a wrong result. The result should be 16s and this is only true if I use half of the speed (20m/s). Can somebody explain me why I have to take half of the speed? Thanks
     
  2. jcsd
  3. Jul 3, 2009 #2

    Borek

    User Avatar

    Staff: Mentor

    At the beginning plane was not moving, then it started to accelerate. Its speed was not constant.
     
  4. Jul 3, 2009 #3

    Doc Al

    User Avatar

    Staff: Mentor

    As Borek said, the speed is not constant. Hint: What's the average speed during takeoff?
     
  5. Jul 3, 2009 #4
    Oh yes..average speed =40/2...thx
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Takeoff time of an aircraft
Loading...