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Homework Help: One dimensional motion problem

  1. Sep 11, 2011 #1
    A car moving at 187km/h is behind a truck thats moving at 71km/h and is 150m ahead of the car

    How long will it take the car to catch the truck ?

    I'm literally in 2 lectures in my physics 101 class but I figure it would be cool to take a shot at the problem. This is what I did...

    87km/h - 71km/h = 16km/h

    16km/h = 4.4m/s

    4.4m/s = 150 / t

    t * 4.4m/s = 150
    t = 150 - 4.4m/s
    t = 146s

    Well I checked it on masteringphysics h.w site and it was wrong...can't think of anything else.
  2. jcsd
  3. Sep 11, 2011 #2
    See red region.Do you got the point? Answer should around 38 seconds.
  4. Sep 11, 2011 #3
    yea, 34s. I was supposed to do 150m / 4.4m/s. thanks
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