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Homework Help: Average Acceleration and Speed

  1. Sep 9, 2015 #1
    1. The problem statement, all variables and given/known data

    You are driving down a highway at a speed of 25.0 mph when your car accelerates at 55 mph in order to pass another car. What is the average acceleration of this car if this increase in speed occurs over a time period of 5.00 seconds?

    t = 5 seconds
    initial speed = 25.0 mph
    acceleration = 55 mph
    2. Relevant equations
    a = delta v/ t

    3. The attempt at a solution
    55+(5/3600)-25 /5
    =0.0176 mph

    the answer is 6.00 mph/s but i still don't understand how to solve for it
  2. jcsd
  3. Sep 10, 2015 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    The problem is incorrectly stated. One accelerates to 55mph, not at 55mph. 55mph cannot be an acceleration as it is in the wrong units. From the context, it is clear that it is intended to be the final speed.
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