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: KE=.5mvf2-.5mvi2 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?