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Work and friction on a car

  1. Dec 5, 2008 #1
    All my friends got different answers to the problem below. What is your answer?

    An 800kg car moving at 6m/s begins to coast down a hill 40m high with its engine off. The driver applies the brakes so that the car's speed at the bottom of the hill is 20m/s. How much energy was lost to friction?
  2. jcsd
  3. Dec 5, 2008 #2


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    Kinetic energy_start + potential energy = kinetic energy_end + friction
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