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-   -   Physics, work energy theorems (https://www.askmehelpdesk.com/showthread.php?t=777234)

  • Dec 1, 2013, 04:43 PM
    leoman
    Physics, work energy theorems
    A 450 kg car is driving at 60mph. The car hits a patch of ice and hits brakes. If coefficient of friction between tires and ice is 0.07, how far will the car slide before coming to a full stop. And how mechanical energy was taken by friction?
  • Dec 6, 2013, 07:05 AM
    ebaines
    Use equivalence of work and energy. The initial kinetic energy of thecar is:



    This energy must be opposed by the work of friction that slows the car to zero. The work done by friction is:



    You can calculate F given the car's weight and coefficient of friction. So now you have everything you need to calculate the distance. As for the second part of the question - I've already given you a good hint for that.

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