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    becca8810's Avatar
    becca8810 Posts: 3, Reputation: 1
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    #1

    Jul 19, 2011, 08:42 PM
    Free help with physical science?
    An airplane has a take off speed of 80 m/s which it reaches 35 second after starting from rest. What us the minimum length of the runway?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jul 19, 2011, 11:21 PM

    Use the kinematics formulae:



    and



    where
    v is the final velocity,
    u is the initial velocity,
    a is the acceleration,
    t is the time taken
    and s is the displacement.
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