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Homework Help: Walking Acceleration Question

  1. Jan 16, 2012 #1
    1. The problem statement, all variables and given/known data

    From t = 0 to t = 5.00 min, a man stands still, and from t = 5.00 min to t = 10.0 min, he walks briskly in a straight line at a constant speed of 1.9 m/s.

    2. Relevant equations

    (a) What is his average velocity vavg in the interval 2.000 min to 7.60 min? ___m/s

    (b) What is his average acceleration aavg in the interval 2.00 min to 7.60 min? ___m/s2

    (c) What is vavg in time 3.00 min to 9.00 min? ___m/s

    (d) What is aavg in time 3.00 min to 9.00 min? ___m/s2

    3. The attempt at a solution

    a) 1.9*2.6/5.6 = .882 m/s right

    b) 1.9/5.6/60 = .006 m/s2 wrong

    c) 1.9*2.6/7 = .707 m/s wrong

    d) 1.9/6/60 = .005 m/s2 wrong

    Where did I go wrong?
  2. jcsd
  3. Jan 16, 2012 #2

    Simon Bridge

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    Science Advisor
    Homework Helper

    how do you determine average velocity and average acceleration?
    why are you dividing by 60 in b and d?
    where did you get the 2.6/7 in c?
    compare - how did you get the 2.6 and the 5.6 in a?
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