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Cars Slam on brakes

  1. Mar 26, 2014 #1
    1. The problem statement, all variables and given/known data
    Car 1 travels 50km/hr
    Car 2 travels 100km/hr
    The Cars are 45m apart
    Car 1 slams on brakes and stops in 8m


    a) Calculate deceleration of Car 1? (Car 1 has the same deceleration as Car 2)

    b) Use deceleration to find the distance it took Car2 to stop?

    c) Did the cars hit?



    The attempt at a solution
    Car 1 = 50 km/hr = 13.89 m/s
    Car 2 = 100 km/hr = 27.78 m/s


    a) Vf^2-Vi^2 = 2a(Delta x)
    0 - 13.89^2 = 2a(8)
    -192.932=16a
    a= -12.05 m/s^2

    b) 0-27.78^2=2(-12.05)x
    -771.7=-24.1x
    Distance it took Car2 to stop is = 32 m

    c) 45-32= 13m apart



    IS THIS RIGHT?
     
  2. jcsd
  3. Mar 26, 2014 #2
    Yes it's right!
     
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