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Thread: Question about velocity in 1 dimension

  1. #1
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    Question about velocity in 1 dimension

    You walk in a straight line for 100m at 2 m/s. You walk straight back to where you started at 4 m/s. What is your average speed?

    So, I know the answer is 2.67 m/s because I got the question wrong but I don't understand how I'm supposed to set this problem up.

    I know average speed is distance/delta(t), and I think the distance is 200m, but I'm unsure how I can get the delta(t)...
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  2. #2
    MHF Contributor
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    Re: Question about velocity in 1 dimension

    speed is absolute distance over time

    It takes 50s to walk the first 100m.

    Then it takes 25s to walk back.

    You cover a total of 200m in 75s

    200m/75s = 8/3 m/s =2.67 m/s
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