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Homework Help: Motion and Force

  1. Sep 25, 2009 #1
    1. The problem statement, all variables and given/known data
    A car traveling at 48 km/h hits a bridge abutment. A passenger in the car moves forward a distance of 53 cm (with respect to the road) while being brought to rest by an inflated air bag. What magnitude of force (assumed constant) acts on the passenger's upper torso, which has a mass of 40 kg?

    2. Relevant equations

    3. The attempt at a solution
    Any idea how to solve this without using kinetic energy equations?
  2. jcsd
  3. Sep 25, 2009 #2


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    Hi tjbateh! :wink:

    You have an initial speed, a final speed, and a distance, so use one of the constant acceleration equations to find the acceleration …

    then use F = ma. :smile:
    Last edited: Sep 25, 2009
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