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Homework Help: Kinetic Energy and cars Please help

  1. Jan 6, 2009 #1
    Kinetic Energy and cars.... Please help

    1. The problem statement, all variables and given/known data
    One car has twice the mass of a second car, but only half as much kinetic Energy. When both cars increase their speed by 6.0 m/s, they then ave the same kinetic energy. What were the original speeds of the two cars.

    2. Relevant equations
    Im not sure but i think its:


    3. The attempt at a solution

    I manipulated the above equation by making KE multiplied by .5 and then removing the .5 from both masses.This however got me no where so could someone please help?
  2. jcsd
  3. Jan 6, 2009 #2


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    Gold Member

    Re: Kinetic Energy and cars.... Please help

    Try writing out the intial and final kinetic energy of each car and then go from there.
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