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The brakes of a car

  1. Jan 3, 2010 #1
    the brakes of a car can slow it down from 60 mi/hr to 40mi/hr in 2 s. how long will it take to bring the car to a stop from an initial velocity of 25 mi/hr at the same acceleration?
     
  2. jcsd
  3. Jan 5, 2010 #2
    You have 60 peanuts and you can eat them so fast, that in 2 seconds you have 40.

    Hint: That's means you can eat 20 peanuts in 2 seconds!!

    At that speed, how long will it take you to eat 25 peanuts?
     
  4. Jan 5, 2010 #3
    Assuming a constant rate of peanut consumption.
     
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