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A child's toy car race car

  1. Oct 30, 2005 #1
    "A child's toy race car travels across the floor with a constant velocity of 2.10m/s. if the car possesses 14.0 j of kinetic energy, find the mass of the car."

    How do i do this question? Am i supposed to use ek=eg or something else?
     
  2. jcsd
  3. Oct 30, 2005 #2

    HallsofIvy

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    Please define your notation. I can guess that ek means kinetic energy but I don't know what eg stands for!

    You are told the speed of the car and the kinetic energy. Do you know th basic definition of kinetic energy Ek= (1/2)mv2?
     
  4. Oct 30, 2005 #3
    eg stands for potential energy Mass*height*gravity
     
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