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Homework Help: I need help

  1. Apr 12, 2005 #1
    The ke energy of a car is 8 x 10 to the 6 J as it travels along a horizontal road. How much work is required to stop the car in 10 s.

    I have ke(f) - ke(i) = work
    o-8 x 1o to 6=-8 x 10 to 6th is this correct
  2. jcsd
  3. Apr 12, 2005 #2


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    That's right. The work required to stop the car in any amount of time (assuming no frictional losses) is just equal to the negative of its initial kinetic energy.
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