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Kinematics car problem

  1. Feb 19, 2007 #1
    A car starts from rest heading due east. It first accelerates at 3.0m/s^2 for 5.0s and then continues without further acceleration for 20.0s. It then brakes for 8.0s in coming to rest. (a) What is the car's velocity after the first 5.0 seconds? (b) What is the car's acceleration over the last 8.0s interval? (c) What is the total displacement?

    3. The attempt at a solution

    This is what i got: a) vf=vi+at

    b) vf=vi+at

    c) d1=37.5m
  2. jcsd
  3. Feb 19, 2007 #2

    15/8 is not 1.7

    d3 would change based on the answer to b.
  4. Feb 19, 2007 #3
    ya it should be -1.9
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