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I'm going through these lecture notes, and I don't understand how one of the example problems was solved. Can anyone show me a step by step solution?

Question: Suppose a Canada goose is flying northwest at 30mph in a wind blowing from the south at 20mph. What is the gooses true course and ground speed?

Thanks

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    I have retagged the question since it consists of vector addition and has no calculus.2012-03-24
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    @Neal I am not quite sure, although I tend to agree with you. *The velocity vector v(t) is the derivative of the position* -- WolframMathWorld [Velocity Vector](http://mathworld.wolfram.com/VelocityVector.html)2012-03-24
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    If position is given as a function of time, as a path through space, then velocity is the time-derivative. However, this question has no time dependence and is taking place in a constant-velocity setting or in an instant of time, so it doesn't involve any actual calculus.2012-03-24

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