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Homework Help: Car Catches Car problem

  1. Sep 1, 2008 #1
    Here's the problem:
    A certain automobile can decelerate at |a1| = 1.7 m/s2. Traveling at a constant v1 = 30 m/s, this car comes up behind a car traveling at a constant v2 = 9 m/s.

    a) What is the speed of the faster car relative to the slower car?
    b) How close to the slower car can the driver of the faster car come before applying his brakes and still avoid a collision?
    c) At what time does the inevitable collision of the two cars occur?
    d) How far beyond its position at t = 0 does the slower car get before it is hit?

    I figured out a) was 21 m/s and b) was 129.7 m. For part c) is says to find the relative speed first which was my answer for a) but I cannot figure out what to do from here. I also need help with part d). Thanks!
  2. jcsd
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