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Math Help - [SOLVED] Instantaneous velocity and Average velocity

  1. #1
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    [SOLVED] Instantaneous velocity and Average velocity

    An airplane maintains a constant acceleration of 4.0m/s^2 [E] as it speeds up from 16m/s [E] to 28m/s [E].

    a) What is the average velocity?

    22m/s [E]

    b) How long does the airplane accelerate?

    3s

    c) When is the instantaneous velocity equal to the average velocity for the interval?

    This is the question I need help on. I know a time is required for this question, though is the instantaneous velocity required too? If it is, how would I solve for it?
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  2. #2
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    Quote Originally Posted by shadow6 View Post
    An airplane maintains a constant acceleration of 4.0m/s^2 [E] as it speeds up from 16m/s [E] to 28m/s [E].

    a) What is the average velocity?

    22m/s [E]

    b) How long does the airplane accelerate?

    3s

    c) When is the instantaneous velocity equal to the average velocity for the interval?

    This is the question I need help on. I know a time is required for this question, though is the instantaneous velocity required too? If it is, how would I solve for it?
    Use Newton's Laws of Motion

    v = u+at

    Set v equal to the average velocity, u to the initial velocity and a to the acceleration

    22 = 16+4t

    Solve for t.
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  3. #3
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    Got the answer, thanks.
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  4. #4
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    Oops ...already done as I was typing I think.
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