1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Work to stop a car

  1. Nov 13, 2007 #1


    User Avatar

    1. The problem statement, all variables and given/known data

    How much work must be done to stop a 1100 kg car traveling at 118 km/hr?

    2. Relevant equations
    Ei + W= Ef
    KE= 1/2mv^2

    3. The attempt at a solution

    KE= 1/2mv^2

    118kmx1000m/360s= 327.78

    327.78^2= 107437.76

    107437.76x1100= 118181537.9

    118181537.9/2 = -5.91x10^7

    thanks for any help
  2. jcsd
  3. Nov 13, 2007 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Recheck that conversion: How many seconds in an hour?
  4. Nov 13, 2007 #3
    do KE = 1/2 (1100 kg)(118*(1000/3600))^2
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Work to stop a car
  1. Work to stop (Replies: 2)

  2. Stopping the car (Replies: 2)

  3. Car stops (Replies: 7)