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Homework Help: Kinetic Promlems/ velocity PLEASE HELP

  1. Jun 11, 2009 #1
    a car is going at 90 km/h

    a truck is 50 km/h

    the car is 100m behind the truck

    so how long does the car need to reach to the truck?
  2. jcsd
  3. Jun 11, 2009 #2
    This should be in the homework help section. but first try writing an equation for the position of the car as a function of time and then write an equation for the position of the truck as a function of time plus 100m (this way the position of the truck is relative to the initial position of the car). Now, when they meet they meet at the same time and the same position so then simply equate the two equations to find the time.
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