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A car with a mass of 1800 kg slows from 42 km/h [E] to 28 km/h [E].

  1. Oct 15, 2013 #1
    1. The problem statement, all variables and given/known data
    A car with a mass of 1800 kg slows from 42 km/h [E] to 28 km/h [E]. The impulse from the brakes is?

    I know its a simple question but I was hoping if I could get a walkthrough. I keep getting the answer 2.5 x 10^4 N*s [W] and the answer is 7.0 x 10^3 N*s


    2. Relevant equations
    p=pf-pi


    3. The attempt at a solution
    (1800)(28[E])-(1800)(42[E])=50400[E]-75600[E]
    =25200[W]
    =2.5 x 10^4 N*s [W]
     
  2. jcsd
  3. Oct 15, 2013 #2

    collinsmark

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    Hello CabalGroupie,

    Welcome to Physics Forums! :smile:

    Don't forget to convert your velocities from kilometers per hour to meters per second. :wink:
     
  4. Oct 15, 2013 #3
    Gahh thank you! I feel so incredibly stupid right now that question bothered me way more then it should have
     
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